Over 315,000 preserved amphibians and reptiles in jars.

One of few lasting examples of the brief octagon craze that developed into folly.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

The miraculous hydrant that saved the Mission District in 1906.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Its buzzing collection honors vibrator history.

A psychedelic labyrinth on the San Francisco bay.

Furniture tries to escape an abandoned building in San Francisco.

It's always summer at the beach inside this former airship hangar.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

The "Prussian Versailles" that is as glorious today as when it was built.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

A 12th-century fortress containing some of Berlin's oldest buildings.

A restaurant and observation deck built in a unique broadcasting antenna.

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

A wunderkammer of mysterious objects and stories.

Where once there was a train station bathroom, there is now this German burger joint.

Metro station with a claim to rock n' roll fame.

Berlin's old airport.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.