This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

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

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

The final resting place of New Orleans' most famous voodoo priestess.

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

When this test site was abandoned, they didn't even bother to take the rocket with them.

The world's first and only escalator for lazy bicycles and their daunted riders.

An urban laboratory.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

One-layer pyramid in Indiana.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A former electrical substation is now home to an eccentric junk art masterpiece.

A store full of vintage and indie toys designed to bring out the kid in even the crustiest of adults.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The second-deepest known cave on Earth, hidden in an extremely remote mountain region.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

Scale replica of China's ancient terracotta tomb warriors and Forbidden City are the side project of an eccentric millionaire.

An emerald-green grotto just a short trip from Austin.

Decaying military base deactivated in the 70s is now visited by urban explorers and military enthusiasts.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.