This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The alley connecting two of country music’s most historic venues has a rich history of its own.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

The middle finger of modernity.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

The only museum with its curator—and her pets—buried inside.

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

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

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

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This enormous censer uses a pulley system installed over 400 years ago.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

You must take the A train... to the last active cemetery in Manhattan.

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.