Roman ruins, natural methane fires and a lovely beach.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

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

A mysterious ancient cemetery with Roman sarcophagi and Lycian inscriptions.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

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

Museum preserving torture methods from the past.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

The world's second-largest sundial, made entirely out of stone.

The world's largest neutrino telescope searches for secrets of the universe at the South Pole.

The Rozenberg wind wall in South Holland makes for smooth sailing through the Calandbrug canal.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

This constantly evolving art space saved an Italian town from its own crippling reputation.

Thousands of well-dressed mummies below a monastery.

Italian cave with exceptional acoustics and an unsavory history.

The world's most active stratovolcano is almost always erupting.

This monument to one of the largest science fiction games of all time bears the names of hundreds of thousands of players.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This elegant arc of a waterfall marks a religious turning point.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.