The beauty of urban decay, hiding some dark secrets.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

Overshadowed by quilts, the artistry of these patterned textiles went underappreciated for too long.

A temple to modernity, tucked away amid Barcelona's more well known museums.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

A beautiful display of nearly 50 bells crafted with a unique design and distinct sound.

A neo-Gothic temple in central Mexico featuring a labyrinthine network of crypts.

Macabre symbols of death and mummies on display set the tone of this Italian purgatory church.

This oak sculpture at the edge of a small woodland is nine feet tall and shrouded in mystery.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

This free, take-a-book shop seems like a trick but isn't.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

Fascinating museum dedicated to the under-appreciated medical history of urology features some wince-inducing devices.

Astonishing collection of helmets, scientific instruments, and medical models.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

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

An abandoned asylum where patients have been forgotten but their possessions remain.

An extensive collection of ancient Egyptian artifacts and mummies.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.