A battle between nature and architecture in the Cambodian jungle.

The largest and, arguably, most scenic fortress in Bhutan.

This penis-focused monastery is dedicated to Buddhism's "Divine Madman."

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an 8th-century Buddhist master.

This giant Buddha statue has 125,000 smaller Buddhas hidden inside it.

A modest reminder of treacherous waters at the Golden Gate.

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

The key to turning shifting dunes into the green oasis of Golden Gate Park.

The remains of a ruined mansion memorialize the 1906 earthquake.

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

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

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

A 300-ship graveyard, with a few still visible at low tide.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.