This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This demon atop the Notre-Dame de Paris looks utterly bored.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

The beautiful baroque library of the Hapsburg empire.

Baroque celebration of the end of the Great Plague of Vienna.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

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

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

An ancient Incan convent on Lake Titicaca's Island of the Moon.

Explore the ruins of war and maritime history along this gorgeously ferocious North Atlantic seascape.

The city of Halifax still bears the scars of the largest explosion prior to the atomic bomb.

The profile of one ill-fated deacon was emblazoned forever on this church window during the Halifax explosion.

This historic cemetery stopped accepting bodies before many Canadian cities were founded.

No one knows the origins of the mysterious stone ruins discovered on a hillside in Halifax.

A beautiful, water-filled quarry that has become a popular haunt for swimmers and artists.

Sculptures, jams, and the wild west collide at this folksy retreat.

This architectural onion has an original 1930's Jerry O'Mahony dining car at its core.

A decidedly out of place statue memorializes the Blues Brothers characters at this water bottling plant.

The 32nd president's sprawling cottage sits on an island enclave jointly managed by the U.S. and Canada.

A rare opportunity to drive across the ocean floor.