Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

This snug medieval lane is one of the narrowest streets in the world.

This tiny island is home to the world's largest colony of Northern gannets.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

A brutalist gem towering over the heart of Milan.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

These shopping center benches are actually a modern art installation.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

A Milanese café entirely designed by the American director Wes Anderson.

This Grade II Listed Building with an Art Nouveau façade once contained a unique print shop.

England's steepest street has such a drastic incline that locals tie their parked cars to lampposts when it gets icy.

The ruins of a megalithic monument sit right in the garden of a luxurious Maltese resort.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

The unexpectedly beloved remnants of a controversial thermal power plant.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

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.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This semi-secret storybook hedge maze is also the oldest garden in the city.