This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

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

A turquoise lake within a volcanic crater.

Ecuador's largest Incan ruins show evidence of sophisticated irrigation and diplomacy among the ancient builders.

A swing to dangle you off the very edge.

The ominously named cave is home to some remarkable ancient art.

The largest stone moai on Rapa Nui.

The walls of this medieval church are covered with perfectly preserved frescos, including a pristine example of the Dance of Death.

The church's remarkable frescoes incorporate Finnish artist Hugh Simberg's trademark themes of death and the supernatural.

Swedish mice can dine at the Nuts of Life restaurant or take a date to the amousement park.

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Ample proof that watery ends make for well-preserved, millenia-old mummies.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

A curious collection dedicated to human and animal anatomy and pathology.

Museum preserving torture methods from the past.

This Viking Age memorial contains the oldest known image of a Täby resident.

This runestone once destroyed by an explosion has been painstakingly reassembled to save its history.

A small church in Uppsala hides the grave of a renowned 18th-century astronomer.

This serene wooded hilltop has a dark history as the climactic point of the Swedish witch trials.

A rare rune stone dedicated to a woman.