The United States Capitol's former columns still stand.

An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Perhaps the most scandalous statue of America's first president.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

It was once the base for a series of domestic terror attacks.

A haunting tribute to pioneering photographer Clover Adams.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

Climb through the life of a Mexican hero as you ascend a 130-foot statue.

A jewel of the Mexico city skyline now slowly crumbles after surviving an earthquake.

This church, buried halfway in lava rock, is all that remains of a Mexican village destroyed by a volcano.

Extraordinary sculpture garden created by an eccentric English poet.

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

Mexico's astounding mummy museum with "the world's smallest mummy."

This crumbling Art Deco movie palace in Mexico City has been abandoned for two decades.

A museum in the former home of Marxist revolutionary Leon Trotsky.

The only castle in North America to ever house European sovereigns.

Diego Rivera's massive tiled fountain and failed infrastructure project.

Part bookstore, part café, and part forest.

Frida Kahlo's childhood home, now a museum of her life and works.

The oldest certified bowling alley in the United States is in the basement of this century-old bar.

This striking art museum holds an amazing series of curiosity cabinets.

Locals dubbed it the "Owl Building" because of its bird-like appearance.