Hundreds of hidden passageways weave through the old quarters of Lyon.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

Come crisp December nights, this fairly plain neighborhood becomes a holiday dream world.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

The prototype for all Nazi concentration camps.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

A spherical "micro-nation" in the heart of Vienna.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

Colorful and chaotic stacked hotel in North Holland.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

The world's longest outdoor escalator takes visitors to the top of China's largest dam and is also shaped like a dragon.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

A musical instrument played by the sea.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A nostalgic bibliographic gem.