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Derby Dike is an Earthworks levee embankment built along the San Diego River in San Diego County, California, by Lieutenant George Derby in 1853. The Derby Dike is a California Historical Landmark No. 244 listed on June 10, 1936. The Derby Dike ran from Old Town San Diego to Point Loma, about 5 miles (8km). A California historical marker is at Taylor Street and Presidio Drive. Before the Derby Dike was built the San Diego River would often overflow its banks and flood parts of Old Town, San Diego and San Diego, California. The other problem was the river would flood San Diego harbor with debris. Lieutenant George Horatio Derby with the United States Army Corps of Topographical Engineers had the Derby Dike built so the river would flow into False Bay, now called Mission Bay, rather than into the at San Diego Bay's harbor. This was one of the first major US Government projects in California. While the Derby Dike helped with the flooding and debris flow into the Harbor, there were still major floods that overwhelm the Derby Dike. A major flood in 1853 destroyed parts of the Derby Dike, and the San Diego River flowed back ino the harbor. By 1875, the Derby Dike was repaired and the river was flowing back into False Bay. A major flood in 1884 again destroyed parts of the Derby Dike, and was repaired again. The Sweetwater Dam was built in 1888 to help stop the flooding problem. Six other dams were built on San Diego River, the last in 1898. The San Diego River was not fullly contained til the 1950s. The largest dam on the river is the El Capitan Dam completed in 1934 that is 27 miles up river from Old Town, San Diego.Derby-Pendleton House was constructed in 1851 by Lieutenant George Horatio Derby.

Old Town is a neighborhood of San Diego, California. It contains 230 acres (93 ha) and is bounded by Interstate 8 on the north, Interstate 5 on the west, Mission Hills on the east and Bankers Hill on the south. It is the oldest settled area in San Diego and is the site of the first European settlement in present-day California. It contains Old Town San Diego State Historic Park and Presidio Park, both of which are listed on the National Register of Historic Places.

Casa de Carrillo House in San Diego, California in San Diego County, is a California Historical Landmark No. 74 listed on December 6, 1932. The Casa de Carrillo House is the oldest residence in San Diego. The Casa de Carrillo House was built by Presidio of San Diego Comandante Francisco María Ruiz (1754–1839). Ruiz was the leader of the Presidio from 1809 to 1827. The Casa de Carrillo house was built next to his pear orchard planted in 1808. The Adobe house was used by his relative and soldier, Joaquín Carrillo, and his family. Joaquín Carrillo, daughter Josefa Carrillo, ran away and sailed from the home and eloped to Chile with Henry Delano Fitch in April 1829. Francisco Ruiz died in 1839, when Joaquín Carrillo died, his son Ramon Carrillo sold the house and land to Lorenzo Soto. The house and land was sold a few times, it was poor condiction when sold in 1932 to George Marston and associates. George Marston and associates restored the house. After the restoration George Marston and associates donated the house and land to the City of San Diego. The City of San Diego turned the house and land into the Presidio Hills Golf Course. A California Historical marker is at the Old Town, San Diego Presidio Hills Golf Course, NE of Juan Street on Wallace Street. The Marker was place there in 1994 by State Department of Parks and Recreation working with the San Diego City Department of Parks and Recreation and Squibob Chapter, E Clampus Vitus.

El Presidio Real de San Diego (Royal Presidio of San Diego) is a historic fort in San Diego, California. It was established on May 14, 1769, by Gaspar de Portolá, leader of the first European land exploration of Alta California - at that time an unexplored northwestern frontier area of New Spain. The presidio was the first permanent European settlement on the Pacific Coast of the present-day United States. As the first of the presidios and Spanish missions in California, it was the base of operations for the Spanish colonization of California. The associated Mission San Diego de Alcalá later moved a few miles away. Essentially abandoned by 1835, the site of the original Presidio lies on a hill within present-day Presidio Park, although no historic structures remain above ground. The San Diego Presidio was registered as a California Historical Landmark in 1932, then declared a National Historic Landmark in 1960.

Fort Stockton, later called Fort Dupont was a historical fortress in San Diego, California built in 1828. The Fort Stockton site is a California Historical Landmark No. 54, listed on December 6, 1932.

Presidio Park is a city historic park in San Diego, California. It is the site where the San Diego Presidio and the San Diego Mission, the first European settlements in what is now the Western United States, were founded in 1769. In 1773 the mission moved a few miles upriver while the fort remained on Presidio Hill. The presidio had been established to protect against Indian attacks or foreign invasions. As the need for such protection disappeared, people preferred to live in Old Town at the foot of the hill, and the fort was gradually abandoned. It was in ruins by 1835.In 1907 George Marston, a wealthy department store owner and civic leader, bought Presidio Hill with the aim of preserving the historic site. Unable to attract city funding, Marston built a private park (planned by architect John Nolan) including the Serra Museum (designed by architect William Templeton Johnson) in 1925. Marston donated the park to the city in 1929.The park encompasses about 40 acres (16 ha) and has views of the city, the San Diego River valley, and the Pacific Ocean. The grounds are open for picnics and play. The facilities can be used for weddings and other special events. The spot in the park where Junípero Serra planted a palm tree when he first arrived in 1769 was declared a California Historical Landmark. Otherwise, no historical structures remain in Presidio Park today. The site is occasionally used for archaeological excavations. A fenced-off area encloses the foundations of the chapel, walls, and other historical sites.

The Cosmopolitan Hotel and Restaurant in the Old Town San Diego State Historic Park is a registered national historic landmark, built in the early 19th century by Juan Bandini and later purchased by Albert Seeley to serve as a stagecoach hotel. In 2010, restorations and added fine dining restaurant revived the hotel to its 1870s charm, making it again a focal point of the original downtown area.

Congress Hall was a historical wooden building in San Diego, California built in 1867. The Congress Hall site is a California Historical Landmark No. 66, listed on December 6, 1932, at 4016 Wallace Street, now Fandango Restaurant. Congress Hall building was a Pony Express Station from 1860 to 1861. Congress Hall was for a time a Robertson's saloon and billiard parlor. Congress Hall was built by George Dewitt Clinton and Washington, and Robinson. A historical marker is at the site of the former building a 2734 Calhoun Street, Old Town San Diego. Vincent Llucia purchased the building in 1870. Congress Hall was moved a to a nearby site across the plaza in 1870, by Vincent Llucia, to 4016 Wallace, Old Town San Diego, now Bara Bara saloon, at the southwest Corner of Calhoun Street and Wallace Street. At 4016 Wallace was the ruins of a 1830 house that had been owned by Rosario Aguilar and then Luis Serrano. The crumbling ruins were removed and Congress Hall moved to this lot. In 1884 Llucia changed the building in to a US Post Office. Vincent Llucia and his son, Vincent P. D. Llucia, became the Postmasters. The Congress Hall building was demolished in 1939.

The Johnson House or Johnson Building is a reconstructed historic building located on La Plaza de Las Armas at 2706 San Diego Avenue in Old Town San Diego State Historic Park in San Diego, California.

Old Town San Diego State Historic Park, located in the Old Town neighborhood of San Diego, California, is a state protected historical park in San Diego. It commemorates the early days of the City of San Diego and includes many historic buildings from the period 1820 to 1870. The park was established in 1968. In 2005 and 2006, California State Parks listed Old Town San Diego as the most visited state park in California. In 1969, the site was registered as California Historical Landmark #830. Then on September 3, 1971, it was added to the National Register of Historic Places as Old Town San Diego Historic District.

Casa de Machado, also called Casa de Machado y Silvas is a historical Adobe building in San Diego, California built in 1832. The Casa de Lopez site is a California Historical Landmark No. 71, listed on December 6, 1932. Casa de Machado was built by José Manuel Machado, pioneer leatherjacket company soldier of the New Spain Army stationed in San Diego. He arrived at the San Diego Presidio in 1782 when he retired. José Manuel Machado built a house, Casa de Stewart, for his daughter Rosa, she married Jack Stewart. Stewart from Maine and was pilot boat operator in Maine. The Stewarts enlarged the house. Carmen Stewart Meza lived in the house for some years. The 1850s it was a Commercial Restaurant. 1930s, The Machado y Silvas family owned the house until the 1930s. In the 1930s and early 1940s the house was rooming-house, café, art studio, and souvenir shop. In 1942 the house became a church, Machado Memorail Chapel. Casa de Machado was acquired by California State Parks in 1968, who had it restored. The Casa de Machado y Silvas house's current address, 2737 San Diego Avenue, in Old Town, San Diego.

Morena/Linda Vista is an at-grade station on the Green Line of the San Diego Trolley system. It is located alongside Friars Road at its intersection with Napa Street. It is located just east of the junction of Morena Boulevard and Linda Vista Road, after which the station is named, in the Morena neighborhood of San Diego. An apartment complex has been constructed next to the station, which also has a 199 space park and ride lot. The University of San Diego can also be reached on foot from this station, as the western entrance of the University is within approximately 5 blocks of the station. This station opened on November 23, 1997 as part of the Blue Line Mission Valley Line extension to Mission San Diego station. Blue Line service to this station was replaced by the Green Line on July 10, 2005 as part of the Mission Valley East extension. Before the opening of the Mission Valley East extension, this station was rebuilt to raise the platform to accommodate the new low-floor trolley vehicles, giving passengers level access to trains without using steps or a wheelchair lift.