This small chapel built into rock is the oldest place of worship in Luxembourg.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

100 massive sculptures in the Hudson River Valley.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

Third time's a charm, or in this case, two testicles are.

Where members of the Crossbow Corps of San Marino demonstrate their skills.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

In 1927, a biplane disappeared while attempting to complete the first non-stop transatlantic flight between Paris and New York City. This memorial stands at the last place it was seen.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

A swaggering, monumental souvenir of the most extravagant party Montreal’s ever thrown.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This unassuming Victorian cemetery is the final resting place of author Lewis Carroll.

This sculpture combines the literary Alice with her real-life inspiration.

The rusty hull of this 1899 ship serves as a tribute to explorers of the bottom of the world.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

The video game-themed street art first popped up in the French city.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.