How big is 4 square miles?
It's about one-one-hundred-fiftieth as big as Houston

The size of Houston is about 579.50 square miles.
(Texas)
The largest city in Texas and the fourth-largest city in the United States as of 2009, Houston measures 579.50 square miles in total area. The city is known for its broad corporate base, prominence in oilfield equipment, and for its port, which accepts more cargo than any other port in the United States.
It's about one-one-hundred-fiftieth as big as London

The size of London is about 609.70 square miles.
(a.k.a. Greater London) (London Region) (England, United Kingdom)
London, one of the most important global cities in the world, currently occupies a total area of 609.70 square miles. For more than one hundred years, between the nineteenth and twentieth centuries, it was the largest city in the world by population.
It's about 150 times as big as Croke Park

The size of Croke Park is about 0.025 square miles.
(a.k.a. Páirc an Chrócaigh) (Dublin, Leinster, Ireland) (stadium area)
Croke Park, the Gaelic games stadium of Dublin, hosts hurling and Gaelic football matches in a 0.025 square miles stadium. The Park offers rooftop tours, where fans can walk along the 44-meters-high walkway.
It's about one-one-hundred-fiftieth as big as Stewart Island

The size of Stewart Island is about 648.70 square miles.
(a.k.a. Rakiura) (Southland, New Zealand) (total land area)
Stewart Island, New Zealand's third-largest island measures 648.70 square miles. Eighty-five percent of the Island, or about 540.50 square miles, is Rakiura National Park, which opened in 2002.
It's about 200 times as big as Windsor Castle

The size of Windsor Castle is about 0.02 square miles.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 0.02 square miles. 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 200 times as big as Rogers Centre

The size of Rogers Centre is about 0.0198 square miles.
(f.k.a. Skydome) (Toronto, Ontario, Canada) (entire complex)
Rogers Centre, a major sports stadium in downtown Toronto, measures a total of 0.0198 square miles over the entire complex. The video board of Rogers Centre has a total area of 0.000131 square miles.
It's about 200 times as big as a Polo field
The size of a Polo field is about 0.0193698347 square miles.
(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 0.0193698347 square miles. 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-two-hundred-fiftieth as big as Cape Town

The size of Cape Town is about 950.20 square miles.
(a.k.a. Kaapstad, a.k.a. iKapa, a.k.a. The Mother City) (Western Cape, South Africa) (for Cape Town metro area)
Cape Town, South Africa's legislative capital, measures 950.20 square miles in total metro area. The core of Cape Town lies at the base of Table Mountain (a.k.a. Huriǂoaxa, a.k.a. Tafelberg), a 1,084.6 m peak.
It's about 250 times as big as The Philippine Arena

The size of The Philippine Arena is about 0.015 square miles.
(Ciudad De Victoria, Bocaue - Bulacan, Philippines) (total footprint)
The largest indoor arena in the world, the multi-use Philippine Area has a total footprint of 0.015 square miles, with the dome itself occupying 0.014 square miles. The floor the arena contains over 9,000 tons of steel.
It's about 250 times as big as Federation Square

The size of Federation Square is about 0.015 square miles.
(Melbourne, Victoria, Australia)
Federation Square, the large public square in the city center of Melbourne, measures 0.015 square miles. The main portion of the square is floored with sandstone blocks from Western Australia.
It's about one-three-hundredth as big as Yosemite National Park

The size of Yosemite National Park is about 1,168.680 square miles.
(Tuolumne, Mariposa, and Madera counties, California, near Mariposa, California) (total land area)
Famous for its granite cliffs and Giant Sequoia groves, Yosemite National Park is 1,168.680 square miles in total area, of which 80.30920 square miles is the well-known Yosemite Valley. The Park is known as the home of Yosemite Falls — the highest waterfall in North America and sixth highest in the world at 739 m (2,420 ft)
It's about 300 times as big as The Principality Stadium

The size of The Principality Stadium is about 0.02 square miles.
(a.k.a. Stadiwm Principality, f.k.a. Millennium Stadium, f.k.a. Stadiwm y Mileniwm) (Cardiff, Wales, United Kingdom) (total footprint)
The 70,000-person-plus capacity stadium of Cardiff, Principality Stadium has a total footprint of 0.02 square miles. Over 40,000 tonnes of concrete and steel during the construction of the stadium.
It's about 350 times as big as The Lincoln Memorial Reflecting Pool

The size of The Lincoln Memorial Reflecting Pool is about 0.0122 square miles.
(Washington, D.C.) (pool surface area)
The Lincoln Memorial Reflecting Pool has a water surface area of 0.0122 square miles. The Pool has a sloping bottom and extends to 80 cm (30 in) in depth at its center.
It's about one-four-hundredth as big as Rhode Island

The size of Rhode Island is about 1,545.05 square miles.
(a.k.a. The State of Rhode Island and Providence Plantations, a.k.a. RI) (United States)
The "Ocean State," Rhode Island measures 1,545.05 square miles in total area. Several large bays totaling 1,044.790 square miles make up 32.4% of its total area.
It's about one-four-hundred-fiftieth as big as Kangaroo Island

The size of Kangaroo Island is about 1,701 square miles.
(a.k.a. Karta) (state of South Australia, Australia)
Kangaroo Island, off the southern coast of Australia, measures 1,701 square miles in total area. The island is famous for its ligurian bee colonies, exporting over 100 tonnes of honey each year.