The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

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

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

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

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

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

Its interior is adorned with some of the best examples of early Christian mosaics.

This poignant art installation raises awareness of violence against women.

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

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Op-art architecture designed for happiness.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A Hungarian pharmacy museum with a box full of mummy powder.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.