This colorful gate stands as an entrance to the walled city of Old San Juan.

The world’s first penitentiary, meant to be humane, drove men insane.

Haunting graffiti left by prisoners of the Spanish Inquisition.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

A stone marker memorializes the spot where the King broke up a street fight with a classic karate stance.

Wisconsin's most celebrated export gets the royal treatment on I-94.

One of Frank Lloyd Wright's final works was this UFO church.

Robots, lasers, and whoopee cushions, oh my!

Literally a million fascinating cartographic artifacts are held in this sprawling university collection.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

This striking art museum holds an amazing series of curiosity cabinets.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

Statue dedicated to the star of an old television show.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

The ancient tomb acts as a calendar that keeps perfect time.

One of Ireland's most infamous prisons for rebels including men, women and children.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The modern birthplace of Irish freedom.

This sprawling bookstore spans four floors and has more than a million books in stock.