These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

Home of a 28-foot tall stalagmite known as the War Club.

A cult archaeology conspiracy theory claims these West Virginia petroglyphs were written by Irish monks in Ogham.

The largest earthwork effigy in the world.

The only working large-scale tea plantation in the United States.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

The home of 1.5 million wood letters for printing is still a functioning workshop.

One man’s vision of living among dinosaurs credits Jesus Christ as the engine of biological evolution.

Ancient petroglyphs discovered only after a massive fire swept across Michigan in the 1880s.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

One of Frank Lloyd Wright's final works was this UFO church.

Once a speakeasy operated by Al Capone, this Milwaukee cigar bar is now a haven for ghost hunters.

The first museum in the United States dedicated entirely to posters.

Tucked in the back of this amazing antique store is an important piece of medical history.

Relics given to a Manhattan church to avoid seizure by the Italian government.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

A swath of France so devastated by war it is still forbidden to go there.