Places heidiruthless Wants to Go

Idaho’s largest, deepest limestone cave is known for its quirky rock formations and bat population.

This underground cave located in the most barren reaches of Idaho is filled with ice year-round.

The secluded site of a 1943 plane crash and amazing rescue is only accessible by hiking through the woods.

Three generations of intrepid collectors display their curious artifacts in a homemade museum right next to the caves they discovered.

These century-old beehive-shaped kilns were built to produce charcoal for nearby mines.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

This set of hot springs also comes with fantastic views.

Jail from the 19th century that was built by inmates.

Once America's longest-manned military fort, now an abandoned hulk.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

A recently-abandoned international exhibition center.

A former salt mine is now a cool picnic spot for families and asthmatics.

This hidden gem is bathed in beautiful natural light.

This shuttered power plant is now Turkey's first industrial archaeology museum.

Large miniature theme park with 100-plus models.

This museum was invented in a novel before being made real by the author.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

A Turkish ghost town abandoned in a population exchange with Greece.

An abused and forgotten metropolis, abandoned for centuries.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

This abandoned building, which is the second-largest structure on the Maltese island of Comino, has a complicated past.

The permanent home of Elektro, the celebrity automaton of the 1939 World's Fair.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.