This groundbreaking 16th-century map is known as "America's birth certificate."

The oldest continuously operating fish market in the United States.

The world's oldest soul food restaurant is also one of its best.

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

One of the first Second Empire-style buildings constructed in North America.

Largest Roman Catholic church in North America.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

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

Recorded as the first person buried in Arlington Cemetery.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

The rogue roots are gradually consuming some of the historic marble grave markers.

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

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

A gift from Scotland to the United States in memory of the 270 lives lost when Pan Am Flight 103 exploded over Lockerbie due to a terrorist bombing.

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 controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The last of Fairfax County's one-room schoolhouses.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

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

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

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

An homage to everyone's favorite prehistoric cartoon family.