The seamy, underground secrets of Portland's criminal past.

A walk through the historic city center, under the streets of Seattle.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

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

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

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

A bizarre house filled with an astounding array of collections.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

An emerald-green grotto just a short trip from Austin.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This star-studded Old Hollywood restaurant is where fettuccine Alfredo made its United States debut.

The last orange grove of the San Fernando Valley is owned and protected by CSU Northridge.

This serene oasis in an affluent Los Angeles neighborhood holds some of Gandhi's ashes and got Elvis into Eastern Philosophy.

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

The private clubhouse for the members of the Academy of Magical Arts.

A castle that was built stone by stone by an eccentric journalist.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

America's most famous piece of self-built architecture.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

World's largest collection of serial killer artwork and other macabre exhibits.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.