Tucson United States A large experimental complex built in the late 1980s to explore the possibility of living outside of the Earth ("Biosphere 1") should the Earth become uninhabitable.

Lark historical United States This active mine is the likely the second biggest open pit copper mine in the world, slightly smaller than the Chuquicamata pit in Chile.

Asheville United States Biltmore Estate, built by George Washington Vanderbilt in the late 1800s, is the largest historic, private home in America, at 179,000 square feet.

Little Rock United States President Clinton chose the city of Little Rock for his presidential library and museum, which also contains the offices of the Clinton Foundation.

Hope United States Bill Clinton, who would become the 42nd president of the USA, was born in Hope, Arkansas. His father died in a car accident before he was born, so his mother lived with his maternal grandparents in this house, which is where Clinton spent the first four years of his life, starting in 1946.

Golden United States Rising out of the plains at the front range north of Denver, the railroad makes a long slow curve of 270 degrees. Called the Big Ten, because the radius of the track’s curve is ten degrees, based on the method railways uses to measure curves.

Cuba historical United States Built in the late 1950s, this landmark has recently been restored, and is part of the Big Fish Supper Club restaurant next door.

Cabinville historical United States The electric shovel that operated at this coal mine was the largest single-bucket excavating machine ever built, and one of the largest mobile earth-moving machines in the world. It used as much electricity as 27,500 homes to scoop out 325 tons of material in each bite (220 cubic yards). Constructed in 1969 it required a crew of seven to operate it. In 1999, the massive machine and its dragline were destroyed and salvaged, as the mine was shut down. Only the huge bucket was preserved for posterity, and tourists.

Beaumont United States Big Hill is a federally-controlled underground petroleum storage site, one of four in the Strategic Petroleum Reserve program of the US Government.

Delaware United States An unusual and extremely large antenna consisting of a 500-foot-long flat array, built on the ground, and two vertical reflectors on either end.