The decaying ruins of Wales' first asylum for the mentally ill.

A long abandoned hospital building on the outskirts of NYC.

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

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

Bad farming practices caused this unnatural natural wonder.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

The final resting place of up to 6,000 Confederate soldiers, the largest mass grave in the Western Hemisphere.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Chicago's North Park Village was once the largest municipal sanatorium in the country.

These abandoned grain silos and tunnels are an urban exploration dream.

A Bibliophile's Dream.

The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”

This suburban enclave is home to a very unique art exhibit.

A community farm in the midst of the Brooklyn concrete.

This magnificent herd of stampeding elephants has been frozen in time for over a century.

Legendary private island in the Bronx...devoid of rats.

This Orthodox Church's exterior is rather unorthodox.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

Walking around West Harlem reveals a scavenger hunt of beautiful bird murals.

A young woman's senseless murder led to the controversial psychological theory of the "bystander effect."

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

In Little Caribbean, an ice-cream shop serves up regional flavors, including soursop, Irish moss, and "greatnut."

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.