An overlooked memorial honoring the local Washington residents who died in World War I.

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

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

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

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

The privately owned cemetery that holds room for Washington's finest when they step down from life.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

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

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

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

What happens here stays here – unless it affects the whole world.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Elevated freight railway turned wildly successful urban park.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

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