Honolulu molasses spill

The Kakaʻako Pumping Station in Honolulu, Hawaii was designed by architect Oliver G. Traphagen in the Richardsonian Romanesque style. He also designed many such bold stone public works buildings in Duluth, Minnesota. Built in 1900, the pumping station features large arched windows, exterior walls of local lava rock, roofs of green tile, and a smokestack 76 feet tall. It was the first sewerage pumping station in Honolulu, Hawaii, designed to address the serious sanitation problems of the rapidly growing city. It is located on an acre of land between the Kewalo Basin and Downtown Honolulu, at Ala Moana Boulevard and Keawe Street. The Ala Moana Pumping Station took over its functions in 1940, and it has remained vacant for many years. Now under the jurisdiction of the Hawaii Community Development Authority, it is slowly being restored by the nonprofit Hawaii Architectural Foundation.Oliver G. Traphagen also designed the "bright and airy" Moana Hotel on Waikiki Beach.

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 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 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.

The John A. Burns School of Medicine (JABSOM) is part of the University of Hawai‘i at Mānoa, and is located on the island of O‘ahu, approximately three miles west of the university's Mānoa campus. The school was named after former Hawaiian Governor John A. Burns in 1965.

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 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.

KWAI (1080 kHz) is a commercial AM radio station in Honolulu, Hawaii, owned by Radio Hawaii, Incorporated. The station offers a talk radio format, including nationally syndicated shows from Thom Hartmann, Roy Masters, Gordon Deal and others, as well as local shows, including paid brokered programming. The station first signed on the air on January 21, 1972. KWAI broadcasts with power of 5000 watts with its transmitter off Kalani Street in Honolulu. KWAI bills itself on air as "The Mighty 1080." It airs national news from the USA Radio Network at the beginning of most hours.

KZOO or Kay-Zoo (1210 AM) is a radio station catering to the Japanese community of Honolulu, Hawaii. The station plays news, talk shows, and J-Pop. It is owned by Polynesian Broadcasting, Inc. KZOO also retransmits on Oceanic Spectrum digital channel 888 for the entire state of Hawaii. KZOO has been broadcasting continuously in Japanese since the station signed on October 18, 1963. It was not the first Japanese-language station in Honolulu (competitor KOHO/1170 signed on in 1959), but it is the only one still on the air today.

KHNR (690 AM) is a conservative talk radio station serving Honolulu, Hawaii. The Salem Media Group outlet broadcasts with a power level of 10,000 watts. Its studios are in Honolulu's Kalihi district, and its transmitter is in the Kakaako neighborhood.

KGU (760 kHz) is a commercial AM radio station in Honolulu, Hawaii, known as "Hawaii Sports Radio Network". It is owned by the Salem Media Group and broadcasts a sports radio format, carrying syndicated programming from the SportsMap Radio Network and VSiN Radio. The radio studios and offices are in Honolulu's Kalihi district, and its transmitter is in the Kakaako neighborhood. AM 760 is a United States clear-channel frequency, on which WJR in Detroit, Michigan is the dominant Class A station. There are only 18 stations on 760 AM within the United States. KGU is far enough away from Detroit that it broadcasts day and night with 10,000 watts, using a non-directional antenna. Programming is also heard on 250 watt FM translator K236CR at 95.1 MHz.

KHCM (880 kHz) is a Chinese-Language AM radio station serving Honolulu, Hawaii. The Salem Media Group outlet broadcasts with a power level of 2 kW. Its studios are in Honolulu's Kalihi district, and its transmitter is in the Kakaako neighborhood.