Kakaako Pumping Station

The Hawai`i Maritime Center was the principal maritime museum in the State of Hawai`i from 1988 until it closed in 2009. Located at Pier 7 of Honolulu Harbor east of Aloha Tower, the center was a campus of the Princess Bernice Pauahi Bishop Museum. The Hawai`i Maritime Center was built on what once was the private boathouse of King David Kalakaua and was home to the only four-masted, full-rigged ship in the world called the Falls of Clyde. The Falls of Clyde was built in 1878 for the oil industry and is a National Historic Landmark. Also docked at the Hawai`i Maritime Center was the voyaging canoe Hokule`a, a scientific research vessel of great importance to native Hawaiian culture. Due to prevailing economic conditions, the Hawai'i Maritime Center was closed to the public effective May 1, 2009. In December 2017, the Bishop Museum transferred its lease between the Maritime Center and the State of Hawaii to a third party, and ceased operating the Center. Plans for its future are unknown.

Falls of Clyde is the last surviving iron-hulled, four-masted full-rigged ship, and the only remaining sail-driven oil tanker. Designated a U.S. National Historic Landmark in 1989, she is now a museum ship in Honolulu, but her condition has deteriorated. She is currently not open to the public. In September 2008, ownership was transferred to a new nonprofit organization, the Friends of Falls of Clyde. Efforts to raise $1.5 million to get the ship into drydock did not succeed. In November 2021 HDOT accepted a bid from Save Falls of Clyde – International (FOCI) to transport the ship to Scotland for restoration.

The Prince Kūhiō Federal Building, formally the Prince Jonah Kūhiō Kalanianaʻole Federal Building and United States Courthouse, is the official seat of the United States federal government and its local branches of various agencies and departments in the state of Hawaiʻi. Its address is 300 Ala Moana Boulevard, Honolulu, Hawaii 96850.The building was completed in 1977 with a total of 929,857 square feet (86,386.5 m2) of working space. It houses the United States District Court for the District of Hawaii, the United States Attorney for the District of Hawaii, the United States Court of Appeals for the Ninth Circuit (Honolulu Division), the offices of Hawaii's U.S. Senators, the offices of Hawaii's U.S. Representatives for Hawaii's 1st congressional district and Hawaii's 2nd congressional district, and branch offices of the United States Secret Service, United States Probation and Pretrial Services System, Department of Homeland Security, United States Department of Justice, Central Intelligence Agency, Federal Bureau of Investigation, Internal Revenue Service, Department of Veterans Affairs, among other entities.The building was named after Prince Jonah Kūhiō Kalanianaʻole, heir to the throne of the overthrown Kingdom of Hawaiʻi, who served as Republican territorial delegate to the United States Congress from 1903 through 1922. It was built on part of the former US Army Fort Armstrong, which was named for Samuel C. Armstrong (1839–1893), son of Hawaiian missionaries. Across Ala Moana Boulevard is the Aloha Tower at the Honolulu harbor. Other parts of Fort Armstrong became a container terminal for military supplies.The Prince Kūhiō Building was constructed to replace the aging Federal Court, Customs House and Post Office building fronting ʻIolani Palace and adjacent to Aliʻiōlani Hale which had been built in 1922 and expanded in 1931. After being mostly vacant, the old building was renovated and put up for sale. The old building was given back to the state of Hawaiʻi and was renamed the King David Kalākaua Building in December 2003.Construction of the Prince Kūhiō Federal Building was not without controversy. The General Services Administration wanted a simple tall office tower, while local architects argued for a building more appropriate to Hawaii. Statutes provided that all buildings between the shoreline and the foot of Punchbowl Crater could not be taller than the Hawaiʻi State Capitol. The federal government, not legally limited by local statutes, defied the statutes and constructed the building as the tallest structure in the path of the capitol building's view of the shoreline. The complex includes ten stories of offices (including a penthouse level), connected by an enclosed bridge to a six-story courthouse building (including basement).The Prince Kūhiō Federal Building was designed by Joseph G.F. Farrell's firm Architects Hawaii. Other government buildings designed by the firm include the capitol building of Palau, which opened in 2006. The building was selected for $121 million of renovations as part of the American Recovery and Reinvestment Act of 2009. The plan is to make the building more efficient by upgrading its mechanical, electrical, fire-safety, and plumbing systems. It had already been cited as an efficient building by the Energy Star program. Traces of asbestos were discovered during the first phase. The second phase of construction was approved in March 2011.

The U.S. Immigration Office in Honolulu, Hawaii was constructed in 1934 based on a design by C.W. Dickey and Herbert C. Cayton. It was listed on the National Register of Historic Places in 1973.Dickey was raised on Maui and became the acknowledged master of what became known as the "territorial style" of Hawaiian architecture. He had earlier designed the Alexander & Baldwin Building in downtown Honolulu, but felt that the somewhat similar design of the Immigration building "summed up his work." Similar renditions of the tiled, double-pitched, hipped "Dickey roof" with wide eaves can be found all over the islands, especially after its revival on many new buildings during the 1980s and 1990s. Other elements of the Dickey style include balanced proportions, open areas designed to provide natural light and ventilation, and decorative details such as the inlaid compass on the waiting room floor and floral patterns on the terra cotta ceiling tiles.The site was a reception center for aliens arriving by ships during the various waves of immigration of laborers to the islands. The site is also recognized for the central role it had as a processing and internment site during World War II. The Honouliuli Internment Camp, near Ewa and Waipahu, is the other site on the island of Oahu that has met the criteria for national significance. The site contained an office building and apartments for the employees of the U.S. Immigration and Naturalization Service and their families. Owned and managed by the General Services Administration, the complex must be returned to state control if declared surplus by the federal government. As of 2014, the building houses Homeland Security Investigations, a branch of U.S. Immigration and Customs Enforcement in the Department of Homeland Security and the State of Hawai‘i Department of Health.A special resource study and environmental assessment released by the National Park Service in August 2015 determined that the Honouliuli Internment Camp historic site is a feasible addition to the national park system conditional upon securing public access to the site. However, the U.S. Immigration Station complex is not a feasible addition because the complex is currently used by the aforementioned governmental departments.

The United States District Court for the District of Hawaii (in case citations, D. Haw.) is the principal trial court of the United States Federal Court System in the state of Hawaii. The court's territorial jurisdiction encompasses the state of Hawaii and the territories of Midway Atoll, Wake Island, Johnston Atoll, Kingman Reef, Palmyra Atoll, Baker Island, Howland Island, and Jarvis Island; it also occasionally handles (jointly with the United States District Court for the District of Columbia and the High Court of American Samoa) federal issues that arise in the territory of American Samoa, which has no local federal court or territorial court. It is located at the Prince Kuhio Federal Building in downtown Honolulu, fronting the Aloha Tower and Honolulu Harbor. The court hears both civil and criminal cases as a court of law and equity. A branch of the district court is the United States Bankruptcy Court which also has chambers in the federal building. The United States Court of Appeals for the Ninth Circuit has appellate jurisdiction over cases coming out of the District of Hawaii (except for patent claims and claims against the U.S. government under the Tucker Act, which are appealed to the Federal Circuit). The United States Attorney for the District of Hawaii represents the United States in all civil and criminal cases within her district. As of January 3, 2022 the United States Attorney is Clare E. Connors.

Downtown station is a planned Honolulu Rail Transit station in Honolulu, Hawaii. It is part of the fourth HART segment, scheduled to open in 2031.The Hawaiian Station Name Working Group proposed Hawaiian names for the twelve rail stations on the eastern end of the rail system (stations in the Airport and City Center segments) in April 2019. The proposed name for this station, Kuloloia (also Kuloloio), is an ancient place name and refers to a sandy beach on the shore of Kou, a favored residence of the chiefess Nāmahana.

The Aloha Tower is a retired lighthouse that is considered one of the landmarks of the state of Hawaii in the United States. Opened on September 11, 1926, at a then astronomical cost of $160,000, the Aloha Tower is located at Pier 9 of Honolulu Harbor. It has been, and continues to be, a guiding beacon welcoming vessels to the City and County of Honolulu. Just as the Statue of Liberty greeted hundreds of thousands of immigrants each year to New York City, the Aloha Tower greeted hundreds of thousands of immigrants to Honolulu. At 10 stories and 184 feet (56 m) of height topped with 40 feet (12 m) of flag mast, for four decades the Aloha Tower was the tallest structure in Hawaii. It was built in the Hawaiian Gothic architectural style.

Honolulu Harbor, also called Kulolia and Ke Awa O Kou and the Port of Honolulu , is the principal seaport of Honolulu and the State of Hawaiʻi in the United States. From the harbor, the City & County of Honolulu was developed and urbanized, in an outward fashion, over the course of the modern history of the island of Oahu. It includes Matson, Inc. harbors on Sand Island.

The Honolulu Sailor's Home is a non-profit lodge for international merchant seamen. The home was incorporated in May 1855 with a lot obtained by a grant from the Kingdom of Hawaii. Originally located on Bethel Street adjacent to the Port of Honolulu, it is now located one block away at 707 Alakea Street

The Aloha Tower Marketplace is a waterfront shopping center in Honolulu, Hawaiʻi. Located at the Honolulu Harbor, the Aloha Tower Marketplace includes several national historic landmarks including the Aloha Tower, Falls of Clyde and Hawaiʻi Maritime Center.

In September 2013, 1,400 tons of molasses spilled into Honolulu Harbor. The spill was discovered on 9 September 2013. It was caused by a faulty pipe, for which the shipping company Matson Navigation Co. took responsibility. Molasses is an unregulated product, and neither Matson nor government officials had a contingency plan to respond to a molasses spill. Natural currents and weather were expected to eventually dilute and flush the molasses out of the harbor and a nearby lagoon.Divers in the harbor area reported that all sea life in the area were killed by the molasses, which instantly sank to the bottom of the harbor and caused widespread deoxygenation. Members of various coral species were injured or killed, and more than 26,000 fish and members of other marine species suffocated and died.The Hawaiian Commercial & Sugar on Maui produces molasses from fresh sugar cane, and ships it to the mainland to be processed and sold. Matson had been transporting molasses from Honolulu Harbor for 30 years and at the time was shipping it about once a week.

The Collection is a high-rise residential building in the Kakaʻako district of Honolulu, Hawaii. Built between 2015 and 2016, the tower stands at 422 ft (129 m) tall with 43 floors and is the current 5th tallest building in Hawaii.