A graffiti Mecca welcoming artists from around the world.

The smallest post office in the United States is no bigger than a broom closet.

A mysterious castle built as a monument to lost love.

The sign that drew attention to a young boy's cucumber stand is now the name of his fruit superstore.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Become a prohibition rebel.

A dilapidated dock tells the story of Titanic's missed arrival.

Elevated freight railway turned wildly successful urban park.

The first piece of public art dedicated to LGBT rights.

A popular European tradition makes its way to the states on one of America's most famous bridges.

An inconspicuous footbridge beloved by San Diego locals.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A massive volcanic plug is now a protected area that hosts a number of bird species.

A hotel and restaurant serving as the mecca of kitsch.

An alley covered with 20 years of bubble gum.

A remote crossroads honoring a fallen talent.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A monument celebrating the idea of reaching inaccessible places.

Located within a historic park, the beacon is the oldest standing structure in Miami.

It turns out that a hurricane-prone beach is probably not the best place to house wild animals.

An abandoned water sports stadium that has become a haven for graffiti and decay.

Former villa and estate of James Deering developed to preserve native tropical forests.

This beautiful Miami garden was designed as a laboratory for tropical plants.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.