Fittingly, America's museum of architecture is itself a magnificently designed old building.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

Elevated freight railway turned wildly successful urban park.

An artist's cute bronze subway sculptures belie his violent artistic past.

This beautiful example of neoclassical architecture is one of Uruguay's most treasured cultural gems.

Perhaps the most scandalous statue of America's first president.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

There’s a hidden military meme engraved on the World War II Memorial.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

A second generation sun-powered marvel lights up the night.

Less a museum than a bizarre fantasy world created by artists and engineers.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Most-visited and most-photographed slot canyon in the American Southwest.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

The city is full of whimsical portals to another world.

Everyone's invited to put on a miniature concert with this world-class musical wonder.

A downtown park built on top of unclaimed graves.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.