Artfully arranged bones of 5,800 Austrians.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

An emerald-green grotto just a short trip from Austin.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

A sprawling collection of over 106,000 toys from around the world.

The prototype for all Nazi concentration camps.

Most-visited and most-photographed slot canyon in the American Southwest.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

The final resting place for the remains of 143 Habsburg royalty.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

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

Ghosts of France's colonial past.

A snapshot of the city's fascinating voodoo culture.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

An intricate and amazing house built by architect Karl Junker.

This "floating railway" is one of the world's oldest monorail systems.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

A Prada store in the West Texas desert that is never open for business.

A self-built castle made by a mysterious man.

Op-art architecture designed for happiness.