Some of the oldest exposed rock formations in the United States.

A historic, scenic mill that was forced to close due to overlogging.

An average of 33 million gallons of water pour out of the collapsed cave at the heart of this spherical spring.

A museum devoted to osteopathy and its creator, Andrew Still.

One of the deepest springs in Missouri.

This wooded grove of beautiful hand-built stone grottos is a hidden gem within a shuttered Franciscan monastery.

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

A mysterious light of unknown origin on the backroads of Missouri.

A subterranean haunt where wine and homemade biscottis are always on the menu.

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

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

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

This abandoned prison castle has become an imposing gallery of graffiti art.

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

European castle ruins in an American state park are actually the product of death and grief.

A vibrant colony of rescued wolves and other canids.

Apparently, the whole cosmos emanates from this plain concrete tower.

In the middle of a desert subdivision, there is supposedly an impact crater site from Kcymaerxthaereal times.

Buried beneath the New Mexico sands are believed to be millions of copies of Atari's E.T. video game.

Setting this massive marionette aflame rids Santa Fe of doom and gloom for another year.

A blacklight journey through a celestial art exhibit.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

Natural sonic phenomenon comes with a grisly legend of murder and blood.