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

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

This Boy Scout retreat acted as "Friday the 13th"'s original Camp Crystal Lake.

Step inside Lucy, the world's largest "elephant."

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

A historic grist mill and active sluice on the Black River.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

Local lore claims this park is named after a young woman who jumped off a cliff.

Mysterious rocks that ring musically when struck.

A recently abandoned psych ward at the end of Sanatorium Road.

This park contains a number of standing stones meant to heal and inspire.

A hidden alley in urban Baltimore is a haven for graffiti artists.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

This 19th century granite fortification is one of the most well preserved forts in New England.

The most photographed house in Maine looks good enough to eat.

This colorful theme park dedicated the official fruit of Maine serves sweet, tasty treats.

Toy museum in a former tavern is the expression of one man's life pursuit of the aesthetic power of cartoon imagery.

The eccentric mansion of one the most popular horror authors of modern times.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

All that's left of the quintessential "cabin in the woods."