Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

A circus legend leaves an unexpected endowment.

A haunted hill that supposedly defied gravity.

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

This "thrice-cursed" island is allegedly home to Captain Kidd's lost treasure.

The arch that celebrated the completion of the Lincoln and Victory highways.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Its columns were all carved from the same white oak tree.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

The oldest operational cathedral in the U.S. has one shell of a way of projecting speakers' voices.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

This bar named after the world's first mixed cocktail was home to one of New Orleans' most notorious politicians.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

The second oldest continuously operating bar in Louisiana.

The curiosities and wonders of pharmacy in a delightful historic building.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

A museum and shop on Bourbon Street located in the French Quarter.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

These engineering masterpieces are a dominant feature of the Belfast skyline.

These barriers stand as stark reminders of Northern Ireland's troubled past.