It's about as big as Fort Knox
(a.k.a. the United States Bullion Depository, a.k.a. "Gold Vault") (Kentucky)
The United States Bullion Depository, commonly referred to by the metonym "Fort Knox" (in spite of the fact that the Depository is not located on the Fort proper), measures 32.0 m (105 ft) by 36.9 m (121 ft), for a total area of about 1.180 dunams. The Depository is most famous for housing the largest portion of the national gold reserve, but has also temporarily housed the original US Declaration of Independence, an original copy of the US Constitution, and other important documents, kept there for safe keeping during World War II.
It's about as big as Manchester Cathedral
In other words, the size of Manchester Cathedral is 1.049 times 1.180 dunams.(a.k.a. Cathedral and Collegiate Church of St Mary, St Denys and St George) (Manchester, England, United Kingdom) (total interior area of Nave, Chapel, Library, Chapter House, and Rectory)
Manchester Cathedral includes a total interior area of 1.2380 dunams between the Nave, Chapel, Library, Chapter House, and Rectory. The height of the Cathedral's bell tower is 41.1 m.
It's about four-fifths as big as a Hockey rink
In other words, 1.180 dunams is 0.7779388460 times the size of a Hockey rink, and the size of a Hockey rink is 1.285448090 times that amount.(per NHL specification)
Per National Hockey League Official Rules, a hockey rink should measure 60.96 m long by 25.908 m wide with a corner arc radius of 8.5344 m, for a total area of about 1.516828740 dunams. Ice hockey is believed to have developed from field hockey after players began holding games on ice rinks, which had been traditionally used for the sport of curling.
It's about two-and-a-half times as big as a Basketball court
In other words, 1.180 dunams is 2.3807711890 times the size of a Basketball court, and the size of a Basketball court is 0.42003196470 times that amount.(per NBA regulation)
Per NBA rules , a basketball court should measure 29.5656 m long by 16.764 m wide, for a total area of 0.49563771840 dunams. The first basketball game, held in a Springfield Massachusetts YMCA, was played on a court half the size of today's NBA standard and ended with a score of 1-0.
It's about three-and-a-half times as big as an IMAX screen
In other words, 1.180 dunams is 3.3310 times the size of an IMAX screen, and the size of an IMAX screen is 0.30020 times that amount.(standard)
An IMAX movie theater screen measures 22 m (72 ft) by 16 m (52 ft) for a total area of 0.35420 dunams. Because the film used in an IMAX movie is more than eight times larger than regular film, the platters of a two-and-a-half hour feature film can weigh up to 250 kg (550 lbs).
It's about one-fourth as big as Bill Gates' Home
In other words, 1.180 dunams is 0.26370 times the size of Bill Gates' Home, and the size of Bill Gates' Home is 3.7920 times that amount.(Medina, Washington)
One of the largest homes in the world, Bill and Melinda Gates' home has a total area of 4.4740 dunams, including 7 bedrooms, 24 bathrooms, 6 kitchens, 6 fireplaces, a 0.230 dunams gym, a 0.09 dunams dining room, and a 0.190 dunams library. It was designed by Bohlin Cywinski Jackson, the same architectural firm responsible for the design of one of Apple Inc's flagship stores on Fifth Avenue in New York City.
It's about four-and-a-half times as big as a Tennis court
In other words, 1.180 dunams is 4.52329560 times the size of a Tennis court, and the size of a Tennis court is 0.221077750 times that amount.(per ITF specification; for doubles)
Per International Tennis Federation Rules of Tennis 2009, a doubles tennis court should measure 23.7744 m long by 10.9728 m, for a total area of about 0.260760 dunams. Courts may be surfaced with crushed red stone, shale, brick, hard-soil grass, or asphalt.