One of the best places to see feral Colonial Spanish Mustangs in the United States.

An eerily abandoned stone tower is all that remains of a demolished dam on Cape Fear River.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

An extraordinary mixture of natural beauty and man-made phenomena.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

A marvel of Byzantine engineering under the streets of Istanbul.

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

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

Most famous work of one of Frank Lloyd Wright's sons.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

A haunted hill that supposedly defied gravity.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

This tangled English forest looks like something right out of a fairytale.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Moonbows over Kentucky.

These eerie outliers of the lightning bug family glow a mysterious blue color.