This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

The United States Capitol's former columns still stand.

The most accurate timepiece in the world.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

A toxic ghost town sitting atop a massive coal fire.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

An eerie, decaying ghost town destined to fade into the forest.

The land is home to swimming ponies and a legendary 18th-century treasure.

The narrowest house in America is seven feet of pure spite.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

A relic of FDR's brief foray into utopian urban planning.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The romance of early commercial flight still fills this Art Deco destination.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

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

Washington's iconic carousel has a nice piece of Civil Rights history.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.