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

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

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

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

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

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

A lively annual event in which thousands of people race to push coffins heavy with bodies up a hill.

John Hendrix predicted the creation of the "Secret City" built as part of the Manhattan Project.

A heartwarming message to those entering and departing Music City from above.

The secret city built by the Manhattan Project.

This award-winning men's bathroom was just too beautiful to not allow women to see.

Mile-long cave system near Great Smoky Mountains.

More than five miles of underground passageways.

Visit this playground of waterfalls, caves and sinkholes.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

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

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.