This little-known, 35,000-specimen collection in Greece is a lepidopterist's dream.

Europe's only museum solely dedicated to the history of whaling still has a fully-functioning whaling ship.

Dedicated to a song so popular the request to "Play Shoreline" became part of Swedish culture.

A little church on a tiny island looks like something from a fairy tale.

The library's graceful rotunda is like a bibliophile's temple.

A walkable map of the world, made from soil and stone by one man.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

This psychedelic tourist trap is a leisurely descent into madness.

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

Nordic giants resurrected from the sea and restored to their former greatness.

The largest of the Fuji Five Lakes is home to an impressive swan population—some real, some with paddles, and one with an observation deck.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.