A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

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.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

A curious memento mori hangs in the magnificent Cathedral of Segovia.

A psychological self-portrait in the form of a giant, segmented head.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

There must be a pun in this haystack somewhere...

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

A public urinal so pretty, it was declared a national monument.

This unattributed sculpture in Amsterdam is hiding in plain sight.

A beautifully eclectic mix of architectural styles.

Besides being home to cave paintings and pre-Columbian Cuban archaeological remains, you get to take a boat through this stalactite and stalagmite covered cave.

This 19th-century fountain's namesake animal isn't what you think it is.

Giant topiary dog once played a role in a terrorist bomb plot.

This 18th-century water provider for Aranjuez was refurbished in 2013 only to be neglected again.

This ancient Visigothic church might hide an ancient treasure.