A grassy pyramid named after a French battle.

Rome's ancient Etruscan rival, now a park full of ruins.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

Gods clash with machines in a power plant regenerated as a museum.

The Pope’s secret escape route.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

Architectural monsters are devouring this palace's every door and window.

The remains of a medieval wall discovered in the basement of a jewelry store.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

A former plague hospital turned medical museum.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

The world's only museum devoted to the wonders of fluorescence.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

The place where Czar Peter I of Russia resided in 1697 during his Grand Embassy.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

This basement museum explores the art and artistry of fascism.

The spectacular history of spectacles on display.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Remnants of cone-shaped fascist bomb shelters in Milan.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

These aggressively sustainable art homes look like something out of 1970's science fiction.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

Commonly acknowledged as the only public monument to the Devil himself.