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This Puerto Rican Telescope Was Built in a Massive Sinkhole

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This Puerto Rican Telescope Was Built in a Massive Sinkhole

Short | 01:50

In 1958, the Pentagon wanted to build a 1,000-foot-long telescope for its ballistic missile program. They ended up building it inside a massive Puerto Rican sinkhole.

On TV

    • Friday
    • 11:00am
    Jul 05
    • Thursday
    • 6:00am
    Jul 11
    • Sunday
    • 10:00pm
    Jul 21

More About This episode

Welcome to Puerto Rico and the U.S. Virgin Islands, where dazzling beaches, towering mountains, and stunning islands of all shapes and sizes meet under brilliant Caribbean skies. But these two U.S. territories have much more to contribute to the American story than magnificent views. Journey with us beyond the tourist hotspots and ocean cruise harbors and discover the region's turbulent but rich history and fascinating characters, from golf and basketball legends to kings of Latin pop and more.

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