A miniature train-ride through Slovenia's largest cave system.

The "dragon babies" of southeastern Europe.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

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

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

This giant temperature attraction created some giant electric bills.

Marta Becket's hand-painted theater in the desert.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Odd outsider art installations surround a Gold Rush-era ghost town.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

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