Landmarks

What is this 13,000+ mile long structure?

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What mountain in Rio de Janeiro, Brazil is known worldwide for its cableway and panoramic views of the city?
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What is the world's largest salt flat, spanning 10,582 square kilometers in southwestern Bolivia?
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In which American state is the Hoover Dam located?
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Where did the Romans go to socialize and bathe?
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What is the world's highest uninterrupted waterfall, with a height of 979 meters and a plunge of 807 meters?
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In which capital city can the Coliseum be found?
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In what country is the Archaeological Site of Troy?
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In what city will you find Michelangelo's David?
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