This unusual building straddles two countries.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

A beautiful little bookshop located in the middle of a desert.

A giant Troll lurks under one of Seattle's oldest bridges.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Dakar is home to one of the oldest African art institutions in West Africa.

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an 8th-century Buddhist master.

The nation’s first institution dedicated to the conservation of Bhutanese textiles.

This 17th-century Bhutanese monastery is ensconced in Buddhist legend.

This Tibetan monastery has survived multiple attacks and is also a sky burial site.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

It's a pretty creepy lock-up.

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

An unmarked, overgrown path through dense vegetation leads to the largest ancient structure in Polynesia.

Museum of Fijian history, including its former tradition of cannibalism.

Located on Guam's south shore, this small cave is named for an ancient and powerful Chamorro Chief.

In ancient times, these fallen standing stones supported a massive house.

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.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

A multi-storied adobe complex has been inhabited for more than a thousand years.

One of the American Southwest's most extensive collections of Navajo rock art.

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.