This 1967 experiment in modular architecture was designed to be a new model for urban living.

Memorial to the 137 lives lost on a ship fire, the whole hulk of which washed up on the Asbury Park shore.

In the 19th century, this canal provided power to mills, machine shops, and other businesses in the area.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

On the Hudson resides one of the largest clocks in the world.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

Local lore claims this park is named after a young woman who jumped off a cliff.

The remains of an old sawmill, gristmill and the surrounding industry dating back to the 18th century.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

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

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

This American Civil War-era fort still stands near the border between Washington, D.C. and Maryland.

A terrace reminiscent of Rome's Spanish Steps is tucked away in a little park in Washington, D.C.

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

This rowhouse doubles as one of the most photographed spots in the nation's capital.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

The tunnel under the Capitol Building where Congress takes out its trash.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

D.C. once had its own tiny rival to the New York Stock Exchange.

A secret greenspace hides atop a Capitol parking garage.