The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A speakeasy takes on Chicago's drinking culture.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Make your reservation to have coffee with some kitties.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

The first declared National Monument in the United States.

This abandoned amusement park was built on a site with a dark history.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

The "Seinfeld" diner.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Home of an evil witch famous within southern folklore.

A museum dedicated to the history and exploration of both popular music and science fiction.

Continuing the tradition of the dime museum in style.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Dramatic river bend surrounds a natural red-rocked pedestal.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.