This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

Holding the most bodies of any cemetery in the United States.

One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.

A crumbling hospital from the 1850s on Roosevelt Island.

Once a purveyor of Santeria supplies, religious products , and household sundries, now closed.

World War II-era Nazi compound nestled in the Santa Monica hills.

First LEED-certified gas station in the United States.

Though tiki culture has gone in and out of fashion, the Tonga Hut has always been flying the flag in Los Angeles.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

A library of rare occult books in Los Angeles.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

Venue for strange sideshow displays and musical acts.

This 19th-century church is now a popular roller rink.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

A huge musical instrument played by the ocean.

A playground built by the kids that is a child's wonderland, and a helicopter parent's nightmare.

An abandoned car and strange wooden debris are among the scattered remains of the old sand and gravel quarry.

The memorial to the victims of the Jonestown Massacre carries the names of 918 lost, including one name people wish wasn't there.