Cat art as far as the eye can see.

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

A floating cat sanctuary on an Amsterdam canal.

Journey through this open museum where even employees remain true to period.

The Spanish king's private bathroom embraced the idea of a porcelain throne.

The fountain marks the area where hundreds of accused witches were burned at the stake.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

In addition to showing films, this one-screen arthouse cinema from the late 1940s is a museum of old film equipment.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

The amazing wonder cabinets of a very rich Austrian archbishop.

This 15th-century aqueduct with distinctive pointed arches was used for irrigation in the Vinalopó valley.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The resting place for anonymous victims of the Danube's dark waters.

The beautiful baroque library of the Hapsburg empire.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

A temple to modernity, tucked away amid Barcelona's more well known museums.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.