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.

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

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

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

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

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

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

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

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

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

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

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

These elevated trucks were put in place as a middle finger to The Man, but are now considered folk art.

Home to Hollywood history and a very special salt crystal.

A unique attraction and museum dedicated to exploring iconic roadside structures.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This 14th century tower house was once the home of Irish poet W.B. Yeats.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

An important pilgrimage site for pagans and early Christians, named for a Celtic goddess-turned-saint.