A mecca of Mexican art and cuisine just over the border.

Located near the U.S.-Mexico border, this park remembers the famous raid of General Francisco “Pancho” Villa and his soldiers.

At this research institute, the chile is king.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

A decommissioned military complex that's now a modern industrial park.

Abandoned power station once home to a squatter community, now being developed into an arts center.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

Risk arrest while partying to fund art.

This block in downtown Brooklyn was a hotbed of antislavery activism along the Underground Railroad.

The gilded vestiges of a sterling department store can still be found in a Brooklyn shopping center.

Brooklyn's most iconic restaurant, resurrected.

An abandoned asylum where patients have been forgotten but their possessions remain.

The final resting place for the famed creator and narrator of "The Twilight Zone."

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

This exhibit allows visitors to wander through the interior of a replica Ice Age glacial cave.

Honorable ranks graduating from the prestigious Army War College work hard to maintain their high standards of honor and erase those who don't.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.