An alley covered with 20 years of bubble gum.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

The huge granite obelisk that towers over a small California town.

This otherworldly church spire reaches up toward the heavens.

The crumbling remains of the first Black-owned and operated hospital in Kansas City.

This abandoned prison castle has become an imposing gallery of graffiti art.

This giant green head remembers one of America's jazz giants.

Community bookshelf of 25-foot-tall book spines.

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

This 15-story mural celebrates the 50th anniversary of the musician's iconic "At Folsom Prison" album.

This private residence was the template for one of the most beloved television homes of all time.

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

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Founded in 1873 to support the needs of the gold mines flourishing nearby, this is the last water-powered foundry in the United States.

California's longest-running tourist attraction is a stump.

The longest covered bridge west of the Mississippi River.

An expansive and intricately restored mansion remains from over a century ago--and so do its ghosts.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

Legend says one of the world's largest marine geysers is actually a whale that got wedged within the rocks.

Home to the "Circus" trees created by Axel Erlandson.

More than 700 species live within this murky marvel of a swamp on California's coast.

This municipal playground was co-created by the father of one of the most playful characters ever.