Fortified medieval tower house with lovely roof garden.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

Brussels' favorite peeing boy has a sister.

From motorcycles to firetrucks and sports cars to horse-drawn carriages, this Belgian collection goes beyond rare cars.

A little sculpture with a large wardrobe.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

An architectural oddity hides in plain sight on this iconic London bridge.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

Remarkable medieval wall paintings decorate this 12th-century, dog-friendly church.

A subterranean playground in an abandoned slate mine.

This cheese shop also houses a museum devoted to Dutch dairy.

Underground attraction offering tours of the foundational ruins of a church nave that collapsed in 1674.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

A vast Communist-era exhibition space in the Bulgarian capital.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

"Holy Wisdom" overlooks the city that became its namesake.

Sofia's legislative center is continuously reinventing itself.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

The hot chocolate here all stems from small, sustainable microproducers in Chiapas and Tabasco.

The only castle in North America to ever house European sovereigns.