This environmental engineering marvel keeps salt water from the Elizabeth River.

This eye-catching sculpture of rural life seems a bit out of place at a suburban intersection in front of a car dealership.

This Federal-style plantation house was once visited by Abraham Lincoln to meet with generals during the Civil War.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

These unusual rooms on wheels are holdovers from the 1960s.

The location where the American Revolution ended.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

The former home of the man whose radical ideas changed the nation.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

The most historic church in Fairfax County played a role in the creation of the American Red Cross.

Once the largest trading firm of enslaved people in the U.S., this building is now a museum that preserves Alexandria's dark past.

Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

This former Cold War missile control site played an important role in the creation of GPS.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

These trees are living witnesses to events that inspired poet Walt Whitman’s service during the American Civil War.

The romance of early commercial flight still fills this Art Deco destination.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Enjoy dishes that founding fathers once ate at this Colonial Williamsburg pub.

This tree is a living witness to the beginning of the Civil Rights Movement.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

This historic, one-acre island is the only legal place to camp in the city of Richmond.