The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

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

A surreal museum of extraordinary industrial objects.

A collection of abandoned typographic signs from Berlin and beyond.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A beautiful but toxic fountain of mercury.

Haven for steampunks.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

Where the line between entertainment and aerospace blurs.

Etched into a dry lake bed, this massive directional indicator is accurate without magnets.

Named after a bandit and the star of several Hollywood prehistoric landscapes, these sandstone formations are a historical part of the Los Angeles natural landscape.

A free library to stumble across, one of many placed worldwide if you know where to look.

This decommissioned DC-3 now forever points into the oncoming wind.

An urban laboratory.

Museum celebrating the achievements of the Soviet space program.

A quartet of rusting satellite goliaths are all that remain of a communication network that protected Britain from German and Russian air strikes.

Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites.

America's only nuclear missile silo open to the public.

The world's largest military aircraft cemetery.

Cold storage for agricultural biodiversity.