This historic national park is covered in the stunning ruins of red rock pueblos.

The Magical World of George Phar Legler.

Most-visited and most-photographed slot canyon in the American Southwest.

World's second largest particle accelerator, where nature reveals its secrets.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

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

This shop for all your super spy needs hides an educational secret.

This grave in a ghost town cemetery marks the death of a witch on a day that never happened.

The longest navigable underground river in the United States is home to countless blind and albino animals.

Piled high inside this warehouse and coffee shop are salvaged goods that span every corner of the globe.

The oldest university museum west of the Mississippi retains its 19th century feel.

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

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

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

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

A spooky defunct railroad tunnel now part of a sprawling trail.

An amazing collection of sculptures and art.

This taxidermic smorgasbord was co-created by an artist poached from the Museum of Natural History.

This Minnesota town celebrated the state's 100-year anniversary by creating a massive ode to nature's smartest bird.

An unusual assortment of art, furniture, and other curiosities.

A museum within a museum, devoted to history's most questionable medical devices.

This large midwestern cavern features impressive rock formations and an underground waterfall.

Half of a waterfall goes into the river while the other half seems to disappear.