An underwater city for the dead.

It turns out that a hurricane-prone beach is probably not the best place to house wild animals.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

Former villa and estate of James Deering developed to preserve native tropical forests.

The timeworn "Yankee Stadium" of the fastest game in the world isn't going anywhere.

An abandoned water sports stadium that has become a haven for graffiti and decay.

A perfect circle of 24 mysterious holes dates back to prehistoric times.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

Over 120,000 curious objects that have shaped our modern world.

The site of one of history's most indelible and horrific tragedies.

A farm in New Jersey grew a most unusual crop for AT&T's testing purposes.

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

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

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

Whimsical artist house in the New Jersey woods.

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

Intricate storybook scenes are tucked inside these shadow boxes, which are tucked inside a library in the Pocono Mountains.

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

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

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

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.