After James Madison's death, his wife and former First Lady Dolley Madison lived in this yellow building near the White House.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

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

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

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

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

This taxidermy horse was a Civil War hero.

The only Leonardo Da Vinci painting in the Western Hemisphere.

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

This unassuming passageway played a key role in one of the most important events in U.S. history.

This monument claims to display the first pot used to cook a famed Southern stew.

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

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

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

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

A much-maligned monument to teetotalism.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

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

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

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.