The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A shining, cold, black organ lies in San Francisco's financial district.

27-room home built with the fortune of a sugar magnate.

Faceless white figures loom over the city from the rooftop.

One of few lasting examples of the brief octagon craze that developed into folly.

A man-made island in scenic San Francisco Bay.

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.

The miraculous hydrant that saved the Mission District in 1906.

Half of a house.

This private residence was the template for one of the most beloved television homes of all time.

A monument to the love people have for their pets.

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

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

This shop specializes in oddities and Victorian-inspired wonders.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.