The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

This 18th-century sundial was designed to calculate the date of Easter each year.

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

A beautifully eclectic mix of architectural styles.

Cat art as far as the eye can see.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

Hidden in the courtyard of the Victoria and Albert Museum is a little-known tribute to two celebrity pooches.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

This museum was invented in a novel before being made real by the author.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

An eerie, little-known Neapolitan museum filled with preserved human remains.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

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

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

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Zurich's evolution museum hosts a unique collection of skeletons among its natural history treasures.