Walk down these stairs to get an underwater view of Switzerland's Lake Zug.

The original building of a mining school endowed by one of the barons of the Comstock Lode now houses a museum of earth science and mining history.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

A perfectly preserved small-town pharmacy and soda fountain that opened in the early 20th century and closed in the 1980s.

A museum specifically dedicated to the Trabant, one of the iconic automobiles of the GDR.

Pause for an afternoon fika with sublime Scandinavian cakes and pastries.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

The prototype for all Nazi concentration camps.

The United States' first transcontinental automobile road came to its end at this spot in San Francisco's Lincoln Park.

This nature center has one of the largest collections of native raptors in the Pacific Northwest.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

The stone circle honors the 19 firemen who perished during the Yarnell Hill Fire.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

The last of a gourmet supermarket chain, this store helped spark California's Food Revolution.

One-of-a-kind museum inside the first Boeing 747-400 ever made.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

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

Explore the wide world of desert plants at this unique Palm Springs botanical garden.

Fifty years after a “blast blasted blubber beyond all believable bounds,” this idyllic natural area commemorates the carnage.

This decommissioned nuclear power plant offers tours of its Communist-era control room and reactor hall.