This delightful little museum is dedicated to only one thing: pasta.

A hospital where antique dolls are given new life.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

The underground sanctuary of a mysterious ancient cult.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A floating cat sanctuary on an Amsterdam canal.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Every color in the rainbow awaits.

The original "capsule building" is a masterpiece of Metabolist architecture.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

France's most famous cemetery, with some of its most curious tombs.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

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

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A beautifully eclectic mix of architectural styles.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.