In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

A water pumping station disguised as a residential home to assuage concerned neighbors now tricks most passersby.

Dedicated to one of the darkest moments in Irish history.

Perhaps the oldest vine in North America, this sprawling plant helps make a sweet wine.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

What looks like a normal building is really a hollow facade hiding a subway vent.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

Erotic art covers the walls of the largest ancient pleasure palace.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

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

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

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

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."