Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

The curiosities and wonders of pharmacy in a delightful historic building.

The world's longest known cave system.

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

Take a drunken tour inside the world's largest known geode.

A museum dedicated to the alleged Roswell Incident.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

World-famous, Pink's still manages to keep its prized cult fetish status.

Two thousand artifacts from around the world collected by one woman who loved to travel.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

Rainbow-hued local gem in Venice.

A hands-on traveling collection of the innovative devices of yesteryear.

Private collection of art inspired by cabinets of curiosity.

This frequently-photographed waterfall takes only a short hike to visit.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

Where America's first doomsday cult awaited the end of the world.

A library of rare occult books in Los Angeles.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.