This medieval city gate is now a blend of the past and the modern world.

An architectural oddity where the triglyphs of the courtyard of walls create an optical illusion.

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

A young Italian couple has been locked in an embrace for over 6,000 years.

The seat of the Mantua bishop holds many secrets within its walls.

It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

The oldest church in Mantua was buried for centuries under the facades of other structures.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

This old medieval prison tower has been a site of astronomical research for more than 250 years.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Home to items never before seen by the public.

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.

A shrine contains nearly 200 statues of the Buddhist deity Jizo, dressed in bibs by parents who have lost a child.

A bronze statue dating back as far as 1252, still has remnants of gold on its right cheek from ancient gilding.

Legend holds eating just one of these black eggs can add seven years to one's life.

A 20-meter (65-foot) robot towers over Tokyo Bay.

This neighborhood thoroughfare is haunted by dozens of homemade monsters.

Not quite the menace it once was, this monster still has some chops.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

The 10,000 Torii shrine.

This 700-year-old street food market features baby octopus and soy donuts.