The location of the world's first telescope demonstration.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Carved fountains poignantly placed in parks and in front of special monuments.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

A fearsome dragon clings to a corner of Munich's city hall.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

It's good luck to be mocked by this monkey.

The world's first combination ski slope and power plant.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

Old Danish castle immortalized in Shakespeare's Hamlet.

Copenhagen's celebrated theme park and gardens.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

A statue of Paulina Hermann, the eccentric noblewoman known as the "mother of cats."

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

Christ's blood allegedly preserved in a Belgian town.

The Habsburgs' royal collections of art and wonders.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.