It's about twenty times as big as Alcatraz.
In other words, the size of Alcatraz is 0.042 times 500 feddans.(a.k.a. The Rock) (California)
Alcatraz Island measures 21 feddans. 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 thirty times as big as Buckingham Palace.
In other words, the size of Buckingham Palace is 0.037 times 500 feddans.(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 18 feddans 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 one-thirtieth as big as San Marino.
In other words, the size of San Marino is 29 times 500 feddans.(a.k.a. The Most Serene Republic of San Marino, a.k.a. Serenissima Repubblica di San Marino)
an Marino is an enclave country located within the Apennine Mountains in Italy, with a total area of 15,000 feddans. Established in 301 CE, San Marino is the oldest sovereign state in the world.
It's about 40 times as big as Windsor Castle.
In other words, the size of Windsor Castle is 0.025 times 500 feddans.(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 13 feddans. It is the largest inhabited castle in the world and is also the oldest in continuous use, having been occupied since it was built by William the Conqueror about 900 years ago.
It's about 40 times as big as a Polo field.
In other words, 500 feddans is 41.8679538 times the size of a Polo field, and the size of a Polo field is 0.023884616 times that amount.(for field polo) (United States Polo Association rules; unboarded side maximum)
An outdoor polo field must measure 274.32 m in length and 146.304 m to in width for a total playing area of up to 11.942308 feddans. Polo traces its origins to an Iranian (then Persian) war game from the 5th Century, which was played with as many as 100 players per side.
It's about one-fiftieth as big as Disney World.
In other words, 500 feddans is 0.0208 times the size of Disney World, and the size of Disney World is 48.1 times that amount.(a.k.a. Walk Disney World Resort, a.k.a. Walt Disney World, a.k.a. WDW) (Lake Buena Vista and Bay Lake, Florida) (total site)
Disney World currently occupies 24,000 feddans. Part of the former total area of 28,600 feddans now comprises the Disney planned community of Celebration, Florida.
It's about one-fiftieth as big as Hilton Head.
In other words, 500 feddans is 0.0192943 times the size of Hilton Head, and the size of Hilton Head is 51.8288 times that amount.(a.k.a. Hilton Head Island) (South Carolina)
Hilton Head Island measures 25,913.9 feddans in total land area. The island (and city of the same name) is located in the Atlantic Ocean and is known as popular vacation destination.