A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

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

The most accurate timepiece in the world.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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

The "lovely red Vega" of the legendary record-settling pilot.

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

An enormous, inside-out glass globe built in 1935.

This impressive Boston holy house is the American mecca for Christian scientists.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

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

The United States Capitol's former columns still stand.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

This lovely hilltop tower was specifically built to withstand 100 MPH winds.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The most visited, and possibly most controversial, museum in Germany.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

The celebrated eyesore created by starry-eyed sweethearts.