This museum chronicles the history of a leprosy quarantine hospital that then became a refuge.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

The cliff and rock formations are made out of Sioux Quartzite.

Built in 1869, this now-retired structure looks more like a medieval fortress than a county lock-up.

This popular park is home to a sea serpent sculpture that now overshadows the twisted history of its creation.

This replica of the Greek structure is in the heart of Nashville.

A mysterious drive-in nestled in the forest that leaves little to the imagination.

Dinosaurs invade a suburban Nashville neighborhood.

The first full-scale tunnel built in America is short but scenic.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

During the 19th-century, this park was a vital trading fort.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

Crumbling Kennedys and a decaying Tecumseh are just some of the haunting remains of one man's cement art trail.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

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

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

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.

One of few surviving standpipe water towers in the U.S.

A Jurassic artscape composed of transmission casings and other mechanical parts.

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

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.