Landmarks

Prior to July 2009, what was the Willis Tower called?

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The ancient Phoenician city of Constantine is located in what modern-day Arab country?
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You can find the Vatican at which location?
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In which U.S. state is Carlsbad Caverns located?
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What is the name of the largest aquarium in North West England located in Cheshire?
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The Hotel Hershey is located in which U.S. state?
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You can find the Gateway Arch at which location?
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In what country is the World Heritage site, Semmering Railway?
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Which waterfall is this?
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