Abandoned concert venue legendary for its rock counterculture.

Toxic waste disaster that founded the Superfund program.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A formerly abandoned mental institute, now back in business.

This abandoned amusement park was built on a site with a dark history.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

This mouldering abandoned mental hospital was once a center for progressive healing.

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

A forsaken wonder in the middle of the East Side neighborhood.

Buffalo's abandoned concrete grain elevators are getting a second life.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

This once sprawling resort now sits abandoned, filled with graffiti and vibrant colors from an era long passed.

An abandoned observatory in the middle of the Illinois prairie.

The remnants of a luxurious resort that saw its peak in the 1970s and 1980s has been abandoned since 2009, leaving behind the wreckage of both the hotel and a beautiful ice skating rink.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

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

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

A wooden rollercoaster that still delivers a thrill.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

An office built to look like a giant basket.