The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The remains of a ruined mansion memorialize the 1906 earthquake.

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

A modern mechanical planetary system, part of a 10,000 year clock.

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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

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

A psychedelic labyrinth on the San Francisco bay.

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

Furniture tries to escape an abandoned building in San Francisco.

The only theatre in the world constructed specifically for sound movement.

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

A huge musical instrument played by the ocean.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The abandoned remains of this Victorian brewery hide crumbling bowling alleys and rusting industrial gear.

Haunting monument to the German Jewish philosopher who died while fleeing fascism.

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A museum dedicated to a Cold War era sausage.

This classic restaurant features a gorgeous mirror-clad room.

A surreal museum of extraordinary industrial objects.

An old department store turned Nazi prison turned artist commune.

A collection of abandoned typographic signs from Berlin and beyond.