Site of a former hidden treehouse in New Orleans.

A 19th-century shrine covered with prosthetic body parts as votive offerings.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

The crumbling remains of a 19th century fortess.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

A museum of unusual collections, mini-towns, and a half-dog, half-alligator.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

A miniature city built by a single hunchbacked monk.

Pink, packed sanctuary and home of the world's fullest-time Elvis fanatic.

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

Famous for its bio-luminescent inhabitants, known as "dismalites."

A Muppet museum in small-town Mississippi honors the roots of Jim Henson's most beloved creation.

Medical museum featuring a number of excellent medical models.

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

The terrified face of Henry Wells is etched on this garret window.

A wax effigy of St. Valentine hides one of the saint's relics.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Curious cave that stays a cool 56 degrees all year long.