World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

The tomb of one of the greatest travelers in history.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

This small, nautical gift shop is home to a 500-pound behemoth.

The longest navigable underground river in the United States is home to countless blind and albino animals.

Reaching this rock formation involves a hike through rocky rapids and springs where wild turtles reproduce.

Catch a ride through the Pennsylvania countryside on this historic narrow-gauge railroad.

This small town Texas cemetery is said to be the burial site of a UFO pilot who crashed in the 1800s.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Once the extravagant escape of the Ford family, this enigmatic ruin now stands as a haunting reminder of its former glory.

Mysterious library of an infamous financier and spiritual seeker.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.

A dark, narrow tunnel that leads to a charming lake and waterfall.

Abortion, prohibition, religion, war, and fear all play a part in the history of this idiosyncratic Pacifica castle.

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

This supermarket offers shoppers a window into the past alongside their groceries.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.