This giant iron playfully pays tribute to an early 20th-century architectural trend.

A museum dedicated to the legacy of Bob Moog and his pioneering synthesizers.

A young woman's senseless murder led to the controversial psychological theory of the "bystander effect."

A rainbow-colored house promotes LGBTQ rights across the street from the Westboro Baptist Church.

A colorful square marks the heart of the city's LGBTQ community.

The first piece of public art dedicated to LGBT rights.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

Massachusetts memorial to murder victim Elizabeth Short near the spot where she was born.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

A rococo retro-futurist future-rustic vernacular between yesterday’s tomorrow and the future that never was.

Furniture tries to escape an abandoned building in San Francisco.

Art in the form of a winding, man made crack in stone.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

A man-made island in scenic San Francisco Bay.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

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.

The remains of a ruined mansion memorialize the 1906 earthquake.

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

An essential stop before plundering, BYO Cutlass.

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