Built by the patron saint of illusionists this Elizabethan manor house is riddled with secret cubbies for hiding priests.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The sculpture of the deceased cockatoo flops atop its personal plinth.

Historic church where a number of Shakespeare's actors are buried.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The television series' iconic giant foot was borrowed from this classical painting.

Eighty million natural history specimens call this gargantuan museum home.

This subterranean studio is filled with fascinating kinetic art.

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

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

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The world's only museum devoted to the wonders of fluorescence.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Get past the gatekeeper's apartment and enter an elaborate hoax of a restaurant with a Masonic feel.