Narrowest house in Boston.

Shelves covered in dozens of coffee bean varieties fill this North End institution.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

An anonymous art project beneath Longfellow Bridge where hundreds of trophies line the steel support beams.

This statue intended for children to enjoy became a minor political spat.

The site of Paul Revere's historic two lantern warning.

A centuries-old church stands as a testament to Boston's "father of architecture."

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Once a resting spot for King Fernando VII.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

The mark of the Devil's horns on a marble column in Milan.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

A brutalist gem towering over the heart of Milan.

See what remains of a once grand ancient Roman circus.

The secret medieval communication system will whisk your words above the noise of the crowd.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

"The prettiest love letters in the world" ... or so said Lord Byron.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.