Archaeological sites and great food inside the island's largest mangrove forest.

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This Wild West attraction is alive with glitching automatons.

The maximum security facility was once thought to have "the bloodiest 47 acres in America."

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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

The deepest spring in Missouri.

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

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

Rusted and decayed, this former mining site is a portal to the past.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Less a museum than a bizarre fantasy world created by artists and engineers.

This mosaic-covered bar is brimming with curated curios.

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

The eccentric and colorful pavilions of Tower Grove park are a beloved and overlooked symbol. 

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

This is not your typical jungle gym.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

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