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

A dilapidated dock tells the story of Titanic's missed arrival.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

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

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

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.

Three acres of mythology-inspired sculptures are visible from the highway.

Ruins of a once-opulent grand Victorian resort.

"Dallas’s pretty much only carnivorous plant gallery."

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

A mythical chimera first sculpted in 1936 as a mix of the main animals of Texas livestock.

This theatre was made famous after Lee Harvey Oswald was captured inside watching a film.

The final resting place of infamous outlaw Clyde and Marvin Barrow.

The final resting place of an outlaw, whose legend grew after death.

Unusual house, in an unusual neighborhood, home to some very unusual peanuts.

Now abandoned, this East Austin school for the disabled began as the "State Colony for the Feeble-minded."

An exquisite grouping of structures made from 10 tons of invasive saplings.

This failed condo development was reborn as a street art hub.

A former electrical substation is now home to an eccentric junk art masterpiece.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

One part antique store, one part curiosities hodge-podge.

An overgrown garden stands as a grim marker of an unrealized dream.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.