England’s ancient oak tree has such an impressive girth, people have been hosting parties within the hollow trunk for centuries.

Taxidermied animals galore, by appointment only.

A kaleidoscopic warehouse-maze of handmade neon signs.

The site of one of the largest non-nuclear explosions in history, created when a massive bomb dump accidentally exploded.

In the U.K., a historic workhouse shines a light on the early, harsh treatment of the poor.

A 13th-century inn where the ill-fated King Charles I spent his last night of freedom.

6000-year-old site covered in more than 50 megaliths.

The tradition of using flowers to decorate wells is once again thriving in England.

An enigmatic natural rock formation with a manmade passage cut through the center.

The collapse of the brand-new dam caused one of the worst floods in British history.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

The ghost town that ended up on Ebay.

An essential stop before plundering, BYO Cutlass.

Rainbow-hued local gem in Venice.

A long-overdue monument to the forgotten British men drafted into the coal mines during World War II.

A 140-year-old castle with underground caves hidden in San Francisco.

These haunting ruins belong to an ancient village that once had one hell of a view.

There's a strange stone hoodoo towering atop a wooded hillside and no one is quite sure how it got there.