For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

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

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

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

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

A mysterious Neolithic tomb is perched along the edge of a modern golf course.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

Renaissance villa and gardens complete with a tormented colossus.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

100 year tradition of fist fights, marked by marble footsteps.

This ancient Roman arch misled treasure hunters for centuries.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A Nesting Doll of Churches.