The scuba diving training facility was named for the steam that rises from the cave's chimney.

Where manatees are the snowbird vacationers in these balmy Florida springs.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

The frozen bubbles that form on the icy surface of this Canadian lake contain enough methane to create a small explosion.

This vast, pristine wilderness is home to a rare subspecies of black bear.

A crumbling cliffside ruin hidden in the woods.

Home inspired by the crystal rock formation of the Emerald Estates.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

An old world fairytale-land with over 350 fairy folk figurines hidden amongst 800 year old cedars.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Crammed inside this grounded passenger plane is a bar that was once a Communist hang out and is now a ratty relic.

Enormous sandstone towers loom within a Czech forest.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

A spiral staircase twists to the top of this unusual Czech lookout tower.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This former quarry is now a picturesque gorge that hides a sunken lake.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

Two monstrous faces loom over a village in Czechia.