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

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

This generously endowed statue once stood guard outside a Roman home.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

A once-secret library of Freemason history in Catalonia.

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.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

The Andean town where every single building is decorated with a brightly colored frieze.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

At the United Kingdom's only residential library you can sleep among the books.

In Faroese legend, this sinister horse-shaped beast lures unsuspecting passersby only to drown them in the lake.

You can spend the night in Dr. Frank-N-Furter's castle.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The home of Ireland's last leprechauns is officially protected by the European Union.

The castle where the Marquis de Sade lived out his darkest fantasies.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

A cluster of granite granaries perched on stilts.