Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

Climb inside an iron crystal magnified 165 billion times its normal size.

This charming, hidden guild museum holds some 700 years of crossbow history.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

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

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

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

A lush indoor jungle fills this bustling Madrid transportation hub.

An ancient Egyptian temple in the middle of Madrid, Spain.

A haven for book enthusiasts across the street from Retiro Park.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

Kingly French toast comes soaked in milk or red wine, then drizzled in a citrus-perfumed syrup.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Step into a pastel time capsule where candy is truly dandy.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The first American department store, and home to the largest operating musical instrument in the world.