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

Harlequin costumes, signed scripts, and armor-wearing puppets.

One of the earliest relics of Italian art is this ornately equipped stone soldier.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Pilgrimage site for star-crossed lovers.

Massive galleon from a box-office bomb docked in Genoa.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Op-art architecture designed for happiness.

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

Baroque celebration of the end of the Great Plague of Vienna.

Mountain where Jesus was first tempted by the Devil.

Week-long block party becomes a competition for the best decorated street.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

An antique curios dealer and hybrid taxidermist.

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

France's most famous cemetery, with some of its most curious tombs.

This bridge was constructed from the rubble of the infamous Bastille.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Macabre astrological automaton clock dating to the late 1400s.

Monument to a suicide protesting the Soviet invasion.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

A 16th-century horror show built in a lovely Italian garden.