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

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

A haunting tribute to pioneering photographer Clover Adams.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A Civil War Museum with some notable medical antiques.

Decades before the scandal, this staircase on the river was a literal "water gate."

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

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

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

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

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

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

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

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

Largest Roman Catholic church in North America.

A priceless collection of the Nation's cryptologic history.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

This simple stone memorial remembers a secret, Geneva Convention-defying interrogation base from WWII.

Meet some of the most prominent figures in Black history through life-sized wax models.

America's first federal monument.

A much-maligned monument to teetotalism.