A papal fortress built to assert Roman control over the independent city of Bologna

A windswept sandstone overlook offers sweeping views across an ancient plateau.

This mechanical marvel is a 24-hour cheese vending machine, holding freshly made cheeses from the internationally acclaimed Perrystead Dairy.

A pub that claims a lineage as one of England's oldest inns, back to 947 AD

Where some of America's earliest LGBTQ rights protests marched each Fourth of July

Gustave Eiffel's masterpiece until the Eiffel Tower was built.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

On the shores of Lake Garda, the ruins of a Roman villa that allegedly belonged to the poet Catullus.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

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

Where Venice's gondolas go for a tune-up.

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

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

A brutalist gem towering over the heart of Milan.

A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

A massive line that stretches across the floor of Bologna’s largest church was created by a 17th-century scientist to measure the movements of the Sun.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

A diverse collection of wax, bone, papier-maché and mummified relics.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

The mummified relic of St. Catherine sits forever on a golden throne.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Across Valencia lie the remains of three ancient fortifications built centuries apart: a Roman enclosure, an Islamic expansion, and a medieval Christian wall.

This bizarrely tree-like red skyscraper is one of the newer additions to Barcelona’s skyline.

Rise early for Kaitlin Guerin’s coveted sweet and savory pastries.