Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

Olfactory delights in San Francisco's Botanical Gardens.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

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

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

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

Its buzzing collection honors vibrator history.

A winding path built in secret on the edge of the continent.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Twelve plaster figures inspired by da Vinci's famed painting haunt the desert landscape above a real-life ghost town.

The most magnificent bottle house in a town strangely full of them.

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

The rocks in this arid basin leave trails of movement behind them.

A huge musical instrument played by the ocean.

Living fossils in this remote Australian bay provide a glimpse of what Earth may have looked like 3.5 billion years ago.

A series of eerie metal stick figures are spread out over four square miles on the bed of a huge salt lake in the Australian Outback.

These Australian rock formations look like Martian beehives that have grown up out of the landscape.

6000-year-old coal fire moves one meter per year.

A stray meteor left this picturesque hole in the Australian outback.

Clusters of huge boulders in the Australian Outback.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.