A small but charming botanical garden that contains many exotic plant species.

Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

The Devil’s own choice when he needs a drink in Brussels.

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

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

2300-year-old Roman road connecting the empire.

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

Pompeii's less famous neighbor is still revealing her secrets.

Founded in 670, this ancient mosque is an architectural time portal.

The only quarter of the Old City not dedicated to a major world religion.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

Source for a sizable portion of Egypt's freshwater supply is more than an optical illusion.

A huge museum of much more than just agriculture displayed in a princess's palace.

The deadliest diving spot in the world is also a stunning geological marvel.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.