Georgetown University's Greek revival astronomical observatory is located on a knoll in the southwest corner of the campus, south of Kehoe Field and north of McDonough Memorial Gym. The observatory is the third oldest in the United States. It was…

Located on a bluff overlooking the Potomac River, Healy Hall is the main symbol of Georgetown University. Construction began in November 1877 and was largely finished by 1879. The building was named after Reverend Patrick Healy (1783-1882), the first…

Three years after introducing the telephone to England and France in 1877, Bell received the Volta Prize of 50,000 francs from the French Government for his invention of the electric speaking telephone. Bell used this money to found the Volta…

City's oldest extant firehouse, built in 1844 for the Vigilant Fire Company (organized 1817); in operation until 1883; gable-end facade with cupola, V-shaped tie rod anchor, stone markers including memorial to Bush the Old Fire Dog (1869) Built on…

The Van Ness Mausoleum, designed by George Hadfield circa 1833, stands on a high knoll on one of the terraced hills of Oak Hill Cemetery in Georgetown. The Mausoleum was made for John Peter Van Ness, his wife, Marcia Burnes Van Ness, their daughter…

Tudor Place is among the foremost Federal era mansions in the nation, designed by William Thornton, architect of the U.S. Capitol. The house's owner, Thomas Peter and his wife, Martha Parke Custis Peter had significant connections to the Washington,…

Built 1908 DC designation January 23, 1973 National Register listing June 27, 1991