A beautiful but toxic fountain of mercury.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

The world's largest wooden structure.

An extraordinary collection of 18th century anatomical waxworks.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

A diverse collection of wax, bone, papier-maché and mummified relics.

Venice's island of the dead.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

The oldest operating pharmacy in the world features 800-year-old recipes.

Water and windows define this defensive Italian well.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

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

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Go inside to really appreciate this 500-year-old technological masterpiece.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

Curios, scientific antiques, oddities for sale.

This Chinese-style quartz sundial was saved in its final hour.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

Final resting place of a 19th century gold prospector and convicted cannibal.