Prehistoric animals decorate this popular outdoor park.

This tiny 19th-century tunnel was built so a man could move his cows from one field to another.

This quirky local sculpture is quite literally a fish out of water.

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

This defunct, fortress-like prison has been the setting for several movies.

Dinosaurs invade a suburban Nashville neighborhood.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

More than five miles of underground passageways.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Home of an evil witch famous within southern folklore.

Over 200 people were buried here with only a small stone to mark their final resting place.

A key producer of charcoal iron in the early 1800s, the structure still stands today.

The "Jade Museum" is full of thousands of intricately carved works of art made from various precious stones.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

Located along historic Route 66, this former gas station has been restored and converted into a museum filled with vintage motorcycles.

A Saint Nicholas-themed ghost town in the Mojave desert.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

The first steel dam in the world and the only one still functional in the United States.

Every year, festive decorations appear on this juniper tree located in the median strip of a busy highway.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

This comprehensive collection features Native American artifacts dating back centuries.

Run by members of the Tohono O'odham Nation, this community farm nurtures traditional desert cultivars.