A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The wooded estate of the Forest Service employee responsible for D.C.’s cherry blossom trees.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

This suburban house is made of dirt, and almost sparked a revolution in home construction.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

This massive swimming pool is the high tech home to the human-powered submarine races.

Dogs, cats, horses, monkeys, frogs, and fish are laid to rest at the second-oldest pet cemetery in the U.S.

This pun was simply waiting to come to life, and one defense contractor made it so.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

Tiny observatory made big contributions to the study of the Earth's motion.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

This golfball sized platinum iridium cylinder is the official starting point for all national weight calibrations

The U.S. government built the million-pound stack of steel during the Space Race.

The whole world in one water tank.