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.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Three columns of volcanic rock shoot out of the ocean.

Dozens of large, brightly-colored paintings adorn the walls of the "street art capital of Iceland."

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Walk in the footsteps of the gods and straddle two tectonic plates.

Medicinal spa created with the discharge from a geothermal energy plant.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Journey through the largest remaining peat bogs in the contiguous United States to see the wilderness as it once was.

America's silhouette includes 100 square miles of wilderness jutting into Canada thanks to an old mapmaking error.

Half of a waterfall goes into the river while the other half seems to disappear.

The smallest post office in the United States is no bigger than a broom closet.

A time capsule of Floridian history fights to survive on the banks of Chokoloskee Bay.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

Bat house that has only ever housed bat for one night; they all flew away and never came back.

The highway's southernmost spot is a beloved local attraction.

"We Seceded Where Others Failed."

A monument celebrating the idea of reaching inaccessible places.