San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

San Francisco's first World's Fair, dedicated to the wonders of California.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The restored and active Victorian-era final resting place of San Francisco.

A monumental cross hides in the trees in Golden Gate Park.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The drama of nature in full effect in this Nevada State Park.

This giant temperature attraction created some giant electric bills.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

The abandoned train depot now doubles as a well-placed rest stop for those who take the road less traveled.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

A music-filled, booze-soaked oasis in the desert.

A fake town founded by Western movie stars is now becoming a hip desert community.

The best Tiki bar in Las Vegas.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A hand-built folk art installation covered with messages of God's love.

An off-grid art installation that encourages its visitors to imagine a world without waste.

The ghostly remains of an accidental sea.

Version of the French Riviera destroyed by the sea.

One of the most unusual geological features, recognizable from a dozen hit movies.