These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

An ancient knight and a symbol of the city's freedom.

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

Gargoyle head that brings good luck.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

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 Hot Springs presents to you "the only outdoor monument to 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.