A world-class collection of mechanical musical instruments and automata.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

A seemingly endless landscape of pure salt stretches far across Bolivia.

A valley of unique erosion patterns lends to a view like nothing on Earth.

A cargo of beautiful music.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Why have you never heard of the second most popular tourist site in New York?

A battle between nature and architecture in the Cambodian jungle.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

These pretty kitties killed and ate as many as 135 railway workers.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Unique antiquarian shop specializing in globes, maps, and prints.

A Natural History and Science Emporium.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Windblown rock formations in an ancient Roman quarry.

Numerical symbolism abound at East Asia's oldest observatory.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Elevated freight railway turned wildly successful urban park.

A decommissioned military complex that's now a modern industrial park.

Haven for steampunks.