This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

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

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

America's first federal monument.

The former home of Thomson Francis Mason, the mayor of Alexandria from 1827-1830.

Dedicated to a U.S. Army lieutenant colonel who was also a bird watcher and artist.

The U.S. Army's giant warehouse of war art includes Hitler’s watercolors and Norman Rockwell oil paintings.

This church is known as "The Home Church of George Washington and George Mason."

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

The FBI's urban training course may have the highest fake crime rate in the world.

This museum explores the grim reality of life in the earliest British colonies in America.

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

Get up close to an F-4 Phantom flown in the Vietnam War at this Florida park.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

The world's largest private aircraft collection.

A haunted hill that supposedly defied gravity.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Electrical pylon in the shape of Disney's beloved mouse.

A mysterious castle built as a monument to lost love.

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.

This Florida museum dedicated to western artwork is entered through an artificial canyon with imported sandstone.

The world's largest collection of autographed baseballs can be found at the St. Petersburg Museum of History.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.