It's about 0.000000010 times as big as Buckingham Palace
In other words, 0.000000770 dunams is 0.00000001000 times the size of Buckingham Palace, and the size of Buckingham Palace is 100,000,000 times that amount.(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 77 dunams of total floor space. The palace was first inhabited by Queen Victoria in 1831, although after the death of her husband in 1861, the Queen endeavored to spend as little time there as public opinion would allow.
It's about 0.000000009 times as big as Alcatraz
In other words, 0.000000770 dunams is 0.00000000870 times the size of Alcatraz, and the size of Alcatraz is 110,000,000 times that amount.(a.k.a. The Rock) (California)
Alcatraz Island measures 89 dunams. It is known a part of the Golden Gate National Recreation Area, and has historically served as a lighthouse, fort, military prison, and — most famously — a federal prison.
It's about 0.000000007 times as big as Ellis Island
In other words, 0.000000770 dunams is 0.000000006940 times the size of Ellis Island, and the size of Ellis Island is 144,000,000 times that amount.(Jersey City, New Jersey and New York City, New York)(now officially part of the Statue of Liberty National Monument)
Ellis Island, home of the Ellis Island Immigration Station, is 111 dunams in total area. Nine-tenths of the island were artificially created after the New York-New Jersey borders had already been defined, leading to a sovereignty dispute which was settled by the US Supreme Court in 1998.
It's about 0.000000006 times as big as The Pentagon
In other words, 0.000000770 dunams is 0.000000005580 times the size of The Pentagon, and the size of The Pentagon is 179,000,000 times that amount.(a.k.a. United States Department of Defense Headquarters) (Washington, D.C.) (total floor area)
The Pentagon, the world's largest office building, contains a total floor area of 138 dunams. Built during World War II, the designers compensated for the steel rations then in effect by using 310,000 cu. m of concrete in the construction efforts.
It's about 0.000000005 times as big as Eden Park
In other words, 0.000000770 dunams is 0.000000005130 times the size of Eden Park, and the size of Eden Park is 195,000,000 times that amount.(Auckland, Auckland Province, New Zealand) (total grounds)
The largest stadium in New Zealand, Eden Park in Auckland measures about 150 dunams over its total grounds. It is primarily a rugby and cricket stadium. The Park offers rooftop tours, where fans can walk along the 39-meters-high roof of the stands.
It's about 0.000000004 times as big as Grand Central Station
In other words, 0.000000770 dunams is 0.00000000400 times the size of Grand Central Station, and the size of Grand Central Station is 300,000,000 times that amount.(formally Grand Central Terminal, a.k.a. Grand Central, a.k.a. GCT) (New York City, New York) (total terminal area).
Grand Central station, the largest train station in the world by platform count, measures 200 dunams in total area. The large flag which was suspended from the concourse ceiling following the September 11th 2001 terrorist attacks measures about 0.07 dunams.
It's about 0.000000004 times as big as Washington National Cathedral
In other words, 0.000000770 dunams is 0.00000000330 times the size of Washington National Cathedral, and the size of Washington National Cathedral is 300,000,000 times that amount.(a.k.a. Cathedral Church of Saint Peter and Saint Paul) (Washington, DC) (total plot)
Sitting atop the 115 m (377 ft) tall Mount Saint Alban at the corner of Massachusetts and Wisconsin Avenues, Washington National Cathedral sits on a landscaped, 230 dunams plot.