The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

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

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

A wunderkammer of curious objects and intriguing art nestled within a hub of ancient Roman sites.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

An ancient stone structure that, according to legend, was built by witches.

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

Warsaw's fantastically preserved gasworks...almost.

The final resting place of the last "gypsy king" of Poland.

A hidden art gallery in an abandoned Warsaw fort.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

The site of the first battle of World War II.

Inside this Krakow church, an explosion of psychedelic color.

A memorial to the beloved brown bear that served in the Polish army during World War II.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

A mesmerizing landscape of 18th-century cellars carved out of the land.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.