These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

An Industrial Revolution-era public work that purified water using nothing but sand.

The national park was once a plantation estate.

A derelict bit of transportation infrastructure hidden in the woods.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

This grand gothic brewery has been pumping out suds for over a hundred years.

The United States Capitol's former columns still stand.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

Headquarters of the legendary clairvoyant's readings, spiritual hospital, and massage school.

The eerie ruins of a remote abandoned hamlet said to be founded by the survivors of a shipwreck.

This statue is dedicated to Grace Sherwood, the last person in Virginia to be convicted of being a witch.

An abandoned outdoor movie theater in the Sinai desert.

A beautiful oddities shop crammed with strange and morbid curiosities.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

The loneliest island in New York.

This semi-hidden Manhattan restaurant is based out of a loading dock.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

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

A celebration of capitalism in Midtown.