Named for the 39 tribes that live in Oklahoma, this restaurant's menu deliciously highlights local flavors.

An acoustic anomaly with a mysterious cause.

Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

This former Texas landfill is flush with 300 million-year-old fossils, all fit for the taking.

This museum presents a dogged pursuit of 500 years of veterinary history.

A 40-foot waterfall flows into this unique natural swimming hole.

An abandoned early-20th-century boomtown sits within the Calico Rock city limits.

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

The only diamond mine in the world where you can keep what you find.

Mobsters came for a soak in the hot springs, and stayed for the illegal gambling and bootlegging.

A chessmaster's dream destination.

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

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

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.