One of the oldest operating hydroelectric power schemes in Australia.

Abandoned power station once home to a squatter community, now being developed into an arts center.

The famous author's cottage hideaway.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Nondescript elevator doors open to reveal a stunning, surreal world.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

A hip bar decorated with walls of golden skulls.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

A semi-scholarly approach to sex.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A crumbling hospital from the 1850s on Roosevelt Island.

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

A terrific purveyor of natural history objects and curios.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Living fossils in this remote Australian bay provide a glimpse of what Earth may have looked like 3.5 billion years ago.

A massive concentration of algae is responsible for this lake's pink hue.

These tracks are believed to be from a panicked dinosaur stampede.