The house where John Wilkes Booth conspired with his co-conspirators.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

At 207 feet, one of the world's longest continuous escalators.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

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

A former major munitions plant that has been converted into a sprawling art space.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

Legend says train robbers stashed their gold within the depths of this unusual cave.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

Limestone caves with spectacular showcase chambers.

The Jewish section of the famous Boothill Graveyard was abandoned for nearly 100 years.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Climb to the top of the world's largest seated bronze Buddha.

This historic train station has been converted to a locomotive themed hotel.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

It's a pretty creepy lock-up.

The resting place of a Civil War celebrity's amputated limb.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.