This subterranean shrine beneath a bike rental store celebrates the iconic Italian scooter.

This ancient market is often referred to as the oldest shopping mall in the world.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

An abandoned Roman salami factory has found new life as an art space home to 200 squatters.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

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

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

A forgotten "city of water" underneath the famous Trevi district.

Contains some of the world's more disturbing wax anatomical models.

Stumbling upon this whimsical wooded garden is like stepping into an enchanted forest full of philosophical musings.

This former medieval prison now unlocks Estonia’s rich photographic history.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

"There's nothing there," and other lies the KGB told us.

Spend your honeymoon where the Devil had his wedding.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

A hidden art gallery in an abandoned Warsaw fort.

The world’s narrowest house makes for an awkward, four-foot-wide living space.