The remains of a century-old mansion that met a fiery demise years after it was deserted.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

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

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

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

Whimsical artist house in the New Jersey woods.

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

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

A winding, cliffside stretch of road overlooking the Delaware River.

A lighthouse built to save lives that took quite a few with its treacherous location.

A beautiful 62-acre Catholic shrine and botanical garden.

A whimsical village of unique treehouses resides in a Washington forest.

This log cabin gallery is one man's gnarly, hand-carved tribute to his favorite trees.

The first full-scale tunnel built in America is short but scenic.

This scented city oasis was a labor of love.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

Moonbows over Kentucky.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

An abandoned town centered around a paper mill powered by a large waterfall.

Roadside collection of 65,000 signs.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.