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

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

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

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

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.

Dedicated to the man who created the first radio wave communication system.

The National Park Service’s best-kept secret with views that rival any in D.C.

The hippo that stands on this university campus was once a drunken flea market purchase.

Surrounded by a verdant garden and a backdrop of ivy, a monument to beloved poet Khalil Gibran stands outside of the Lebanese embassy.

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

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

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

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

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

A secret greenspace hides atop a Capitol parking garage.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

A portal into the bricked up canal that runs through the heart of Washington D.C.