A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

The first modernist church in Europe.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

This spooky statue sits outside a famous Prague theater.

Fantastic stories on a miniature railroad.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

A series of playful yellow penguins share a serious message about the environment.

A stairway to heaven, or to nowhere at all.

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

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

A fearsome dragon clings to a corner of Munich's city hall.

The footprint of a frustrated devil in Munich's Cathedral.

Get past the gatekeeper's apartment and enter an elaborate hoax of a restaurant with a Masonic feel.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Geothermal waterfalls in Tuscany.

Fortified medieval tower house with lovely roof garden.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Giant, friendly pelicans in Central London, the most unlikely of places.