Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

These crumbling foundations are all that remain of the once-stately 1840s manor that gave the town of Bradenton its name.

At Macon’s oldest cemetery two members of Allman Brothers are buried side by side.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

The final resting place of the most famous outlaw in the Old West.

The site where Confederate president Jefferson Davis was defeated has been marked with a bust... that leaves that part out.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

The house that Southern rock built now stands as a monument to one of the genre's favorite families.

Tucked away in the forests of North Florida resides a 19th-century lighthouse.

The bottle house obsession struck a Florida man in his retirement, and now he can't stop building.

This Florida arena, once host to "the fastest game in the world," has sat empty for 25 years.

Sasqu(w)atch out!

This folk art compound was built by a fortune teller on the advice of three people from the future.

Hundreds of skulls and bones at the largest skeleton museum in the country.

This divisive system of turtle tunnels was built to save animals stranded after a highway split a lake in half.

A trove of tiny treasures hidden within a Florida park.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

This Art-Deco movie palace is the oldest independent cinema in Atlanta.

Mai Tais and Navy Grog served up in one of the original tiki bars.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.