A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

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

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Pilgrimage site for star-crossed lovers.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

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

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

Architectural monsters are devouring this palace's every door and window.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

A collection of objects supposedly singed by the hands of souls in purgatory.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

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

These "anatomical machines" are only one of the many strange items in this Italian crypt.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

The mystic whose incorrupt corpse still attracts the faithful.

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