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

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

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

After miraculously surviving a giant flood, the 19th-century nut tree and its offspring are protected with their own tiny park.

A sculpture of a giant man escaping from the depths of the Earth.

Famous church recognized for both its unique design and disciplined monks that live according to the Benedictine discipline.

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

This majestic tree has survived 400 years of storms, droughts, and floods, and is a beloved natural landmark in Missouri.

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

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

This "little gallery in the middle of nowhere" is housed in a 170-year-old horse barn in the Missouri Ozarks.

Giant granite rocks standing end-to-end like a train of circus elephants.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Erosion and time have created a naturally-formed water park.

The world's second largest rocking chair is found on Route 66 in Cuba... Missouri.

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

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

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

See six states, pickled freaks, rocks, and antiques.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

The largest self-built castle in the U.S., six decades in the making.

This lovely hilltop tower was specifically built to withstand 100 MPH winds.

These etchings reveal the history of a long-gone quarantine site.