A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

This abandoned sea fort has become an accidental bird sanctuary.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

World War II bunker still standing on the New Jersey beach.

A desiccated merman and a walrus penis bone are among the oddities in this eclectic collection of shipwreck treasures.

World War II-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers.

Pennsylvania's own Roswell-style UFO mystery.