It's about as big as The Mall of America.
It's about nine-tenths as big as Vatican City.
In other words, 390 dunams is 0.89 times the size of Vatican City, and the size of Vatican City is 1.1 times that amount.(a.k.a. Holy See, a.k.a. State of the Vatican City, a.k.a. Stato della Città del Vaticano)
It's about three-fifths as big as Disneyland.
In other words, the size of Disneyland is 1.7 times 390 dunams.(a.k.a. Disneyland Park) (Anaheim, California) (public areas)
It's about one-and-seven-tenths times as big as Washington National Cathedral.
In other words, the size of Washington National Cathedral is 0.59 times 390 dunams.(a.k.a. Cathedral Church of Saint Peter and Saint Paul) (Washington, DC) (total plot)
It's about one-and-seven-tenths times as big as The United States Capitol.
In other words, the size of The United States Capitol is 0.59 times 390 dunams.(Washington, DC) (Immediate grounds size)
It's about half as big as The Forbidden City.
In other words, 390 dunams is 0.53 times the size of The Forbidden City, and the size of The Forbidden City is 1.9 times that amount.(a.k.a. Forbidden Palace, a.k.a. Purple Forbidden City, a.k.a. Zijin Cheng, a.k.a. Zǐjinchéng, a.k.a. 紫禁城) (Beijing, China)
It's about two times as big as Grand Central Station.
In other words, the size of Grand Central Station is 0.5 times 390 dunams.(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.