The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

San Francisco Bay's ghost town.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Abandoned railway line circling the city of Paris.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Hidden beneath the streets of London is a secret subway that only carried mail.

The only thing stranger than stumbling onto these philosophical musings is the story of the homesteader who created them.

In California, colorful roadside signs remind us all that love transcends borders.

In this roadside "community for the small," abandoned toys gain new lives.

Shoot for par over the bodies of the dead on this cemetery-cum-golf course.

Factory that once supported an entire company town of 350.

A deserted hodgepodge of experimental structures designed by nearby university students.

Rusty industrial city full of oxidized distillation towers.

Gold Rush-era tombstones line the park's paths.

This turn of the century masterpiece has a mysterious goaty interloper.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

This former stomping grounds of the most eminent astronomers of the early 20th century.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

Dozens of lights dangle from the branches of what may be the brightest tree in Los Angeles.

Visible below the waves are memorials to the city's Gold Rush dead.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

An art supply shop holds the secrets of this quiet neighborhood's raucous Barbary Coast past.

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