A spiritual vortex among the red rocks in Sedona.

Live long and prosper in Vulcan, Alberta.

As if T-rex wasn't big enough, this Canadian monument is four times larger than the real thing.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian badlands.

The granite head appears to be deep in thought and half buried in the ground.

The ghost town that ended up on Ebay.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

An artificial crater field that trained astronauts for lunar exploration.

A stealthy Apache hideaway that became the haunting site of a mass grave.

Tacoma’s 25-foot coffee pot music spot has served up over 80 years of concrete kitsch.

This Oregon farm is dedicated to teaching people the professional art of tree climbing.

An institution that preserves the history of institutionalization.

This charmingly homemade amusement park has been growing for 40 years.

This nature center has one of the largest collections of native raptors in the Pacific Northwest.

A tourist attraction founded around a slumping cabin.

Canyon walls shrouded in ferns.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A 140-year-old castle with underground caves hidden in San Francisco.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

San Francisco's newly reopened hands-on science museum.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

A museum befitting the city responsible for supplying the majority of the world's LSD.

This shop specializes in oddities and Victorian-inspired wonders.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.