Though the most famous landmarks in Washington, D.C. receive thousands of visitors each year, some have amazingly well-kept secrets. For instance, there's a crypt in the basement of the Capitol that was meant for George Washington, but the first president was never laid to rest there. Georgetown University's campus sits atop a network of underground tunnels. The maintenance tunnels are popular among adventurous students who have been reported to visit the tunnels for graffiti, firsthand reports, and secret-society meetings. And the Washington National Cathedral holds a 3 billion-year-old piece of space. A roughly two-inch piece of moon rock is embedded in the Space Window, which is on the south side of the Washington National Cathedral. The cathedral's Space Window took inspiration from photographs taken during the Apollo 11 mission and is inscribed with a Bible verse that says: "Is not God in the height of Heaven?"

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