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

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.

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

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

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

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

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

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

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

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

Art deco landmark on the outskirts of Washington, D.C.

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

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

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.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

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

Largest Roman Catholic church in North America.