When the rain falls, this drain system turns into a musical instrument.

A fascinating insight into daily life in the Eastern Bloc.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

The most visited, and possibly most controversial, museum in Germany.

An eerie, derelict amusement park in Berlin.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The oldest working mechanical clock in the world.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

High winds can make this one scary landing.

The platform atop this verdant volcano was built with the help of a royal elephant.

Come for the flowers, stay for the bats!

Ancient pueblos built into the base of a natural canyon wall.

Even Henry David Thoreau found this glacial pothole irresistible.

A massive sustainable farm designed by the mastermind behind Central Park.

A wonderful display of arts and crafts handmade by local artisans in the Southern Appalachians.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

This rocky spread has been squeezed up directly from the bowels of the earth.

An ancient Viking village in North America that predates Columbus by 500 years.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

A unique columnar residence built in the 19th century.