A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

An abandoned saucer-shaped monument in the Bulgarian mountains.

The world's smallest drawbridge.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

This little-known memorial honors those who have donated their bodies to medical training.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

An autonomous oak in Alabama.

These ruins are all that's left of the former Alabama State Capitol.

A rusted metal giant pays tribute to Birmingham’s industrial past.

Every last book in this bookstore is signed by the author.

Orr Park's dead trees have been carved into a menagerie of whimsical visages.

A wealth of local folk art, antiques, and curios, without ever leaving your car.

148 feet long and in the middle of a verdant forest.

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

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

Whimsical bronze sculptures of smiling coins and houses await visitors to this park.

This abandoned nuclear cooling tower casts a shadow over a bucolic town.

The pan man stands as a testament to the functionality of American cast iron cookware.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

It may take some time to locate, but it's sure to warm even a heart of stone.

More than five miles of underground passageways.