Washington's iconic carousel has a nice piece of Civil Rights history.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

It was once the base for a series of domestic terror attacks.

Largest Roman Catholic church in North America.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

This elaborate towering structure was once famed for its revolutionary height.

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

A statue honoring 44 continuous years of greeting passing ships.

This kitschy tavern is also home to rare early editions of "Treasure Island."

After just one epic test blast, this literal loose cannon proved too explosive for combat.

A white oak with property rights.

Come for the speed, leave in love with the desert.

Visitors to this library are in for a real-world education in modernist architecture.

A technicolor place of worship for Elevationists.

Final resting place of a 19th century gold prospector and convicted cannibal.

A collection of over 15,000 zines works to preserve DIY publishing culture.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

The Flatiron Building's storied West Coast cousin is a lot more into religion.

A pier that used to act as a busy ferry dock is now a decaying favorite of local fisherman and urban artists.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.