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

There’s a hidden military meme engraved on the World War II Memorial.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

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 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.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

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

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

A former major munitions plant that has been converted into a sprawling art space.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

This statue inspired by Renoir's famous painting embodies the jovial spirit of Key West.

A historic landmark and museum filled with curious objects representing the history of Key West.

The highway's southernmost spot is a beloved local attraction.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

"We Seceded Where Others Failed."

Bat house that has only ever housed bat for one night; they all flew away and never came back.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

A mysterious castle built as a monument to lost love.