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

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

Ship skeletons haunt Baltimore's waterways.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

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.

The likeness of the Baltimore music icon was unveiled in time for the anniversary of his Senate hearings on music censorship.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

A celebrity from the late Cretaceous period.

The span is crooked and made from two older recycled bridges.

Every drop of D.C. tap water flows through this old waterworks.

When it comes to handsignals (and colonialism) rock always beats scissors.

This poor little statue is the most vandalized memorial in Washington.

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

The world's oldest continuously operating airport was founded by the Wright Brothers.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

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

A historic arena where the Beatles played their first concert in the U.S.

An Industrial Revolution-era public work that purified water using nothing but sand.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

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