Fortified homes of highland warriors that are still in use today.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Ancient rock-hewn town that witnessed key events of Georgian history.

These unusual rooms on wheels are holdovers from the 1960s.

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

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

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

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

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

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

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

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

Exact replica of the ancient monument, but much, much lighter.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A winding district gerrymandered into the shape of a mantis.

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

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

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

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

A local farm's collection of unusual structures from a now defunct storybook amusement park.

The tombstone of the founder of the lost town of Ogletown is now stuck inside a traffic median.