An ancient Egyptian temple in the middle of Madrid, Spain.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

One of the smallest bookstores on the planet.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

A kaleidoscopic warehouse-maze of handmade neon signs.

A collection of decorative eggs to admire in the off-season.

A 1:2 billion-scale solar system leads visitors into this German university town.

This small gallery nestled inside an old botanical glasshouse is a quiet place to enjoy art and nature.

Small museum dedicated to one of the founding fathers of modern astronautics.

A collection of 4,000 thimbles that's more versatile than one might imagine.

This small town in Germany was once a center of peppermint production, and has the museum to prove it.

This tremendous timepiece was once the largest cuckoo clock in the world.

Named after the German word for "a longingness to travel," this park brings together thousands of city and street signs from around the world.

A surprisingly detailed model of one of the most powerful telescopes in the world.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

The only remaining U-boat that is still floating never actually saw any action in World War II.

This historic toy museum brings a little whimsy to a city not usually remembered for such things.

A delightful but little-known public observatory and planetarium in Munich.

To the great disappointment of doomsdayers, this codex merely contains records of the Moon and Venus.

A modern museum dedicated to the fairytales and dictionary work of the Brothers Grimm.

A series of haunting wooden totems are hidden in the woods surrounding a German environmental center.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.