Every equinox this Maya pyramid puts on a spooky ancient light show.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

This century-old roadside attraction is full of bizarre rock formations.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

A monument celebrating the idea of reaching inaccessible places.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

The world's largest squirrel statue clutches a pecan bigger than your head.

The highest point in Washington state is a volcano covered in glaciers.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

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

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

The fifth-longest natural arch in the world, and the longest outside China.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The pit stop from "The Texas Chainsaw Massacre" now serves beef and pork barbecue, not people.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

An impressive collection is dedicated to the legendary beast.

The summer home of the largest colony of bats in the world.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

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

A 24-hour vending machine restocked daily with homemade full-sized pecan pies.

A popular swimming hole that hides one of America's most deadly diving spots.