Two stone columns flank the grand Venice square, but there were supposed to be three.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

Go inside to really appreciate this 500-year-old technological masterpiece.

Theater has had many different incarnations but has survived the ravages of time.

This statue of the "father of television" stands prominently in the United States Capitol.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

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

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

An overgrown collection of miniature buildings still stand as evidence of one couple's obsession with The King.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

This nine-story building is the oldest standing skyscraper in D.C.

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

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Go take a picture with the inventor of the daguerreotype photographic process.

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

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.