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

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

Acres of natural wonders left behind by a socialite-turned-gardener.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

An abandoned boat that's been stranded mysteriously for decades.

In the "Danish Capital of America," a replica of one of Copenhagen's most iconic buildings.

Get up close to emus and ostriches, or buy their tasty meat.

California's oldest wind harp represents a historic piece of America's Danish history.

The abandoned personal amusement park of the King of Pop.

One of the last free public hot springs is decorated with hippie art.

Quite simply the largest tree in the world (by volume).

This small shack near the entrance to Sequoia National Park has been in almost continuous operation for the last century.

A 19th-century cabin built into a hollowed-out Sequoia tree.

Remnants of the United States's largest accidental oil spill still mar a California valley.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

The unbelievably opulent home built for an infamous newspaperman.

A hotel and restaurant serving as the mecca of kitsch.

A house built from trash known as the poor man's Hearst Castle.

The Zalud family experienced a number of tragedies in one decade, giving rise to rumors that the 19th century house is haunted.