Asia's largest limestone cave is home to a world of plastic goblins and gold mining history.

This psychedelic tourist trap is a leisurely descent into madness.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

This fantastical icy castle is built anew every winter.

The world's first ice hotel is still one of the most elaborate and beautiful.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

A mysterious stele of unknown origin sits on the peak of this curious mountain.

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

An Australian lake whose pink hue defies scientific explanation.

Stunning wetlands ablaze with pink lotus flowers.

A gallery specifically dedicated to the botanical illustrations of a remarkable traveling lady.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Two New York rooftops are home to the largest rooftop soil farms in the world.

The oldest continuously operating farm in New York State.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

Visit the site of a subway powered by nothing more than air--and lots of it.