La Palma, Spain
Gran Telescopio Canarias
The world's largest single-aperture telescope resides in the Canary Islands.
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La Palma, Spain
The world's largest single-aperture telescope resides in the Canary Islands.
Caltanissetta, Italy
The tallest structure in Italy is a remote radio transmitter in Sicily.
Jettingen-Scheppach, Germany
The world's first jet-powered aircraft were assembled by the Germans in this secret factory in the forest during WWII.
Atlanta, Georgia
One of the world’s largest collections of paper memorabilia chronicles 4,000 years of papermaking.
Washington, D.C.
Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.