The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

The final resting place of the poets Shelley and Keats.

The mummified relic of St. Antoninus.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Europe's simulation of the Martian surface uses soil from Mount Vesuvius.

Some people believe that this makeshift space monitoring station received transmissions from clandestine cosmonauts.

Beautiful antiques and obscure engineering artifacts trace the evolution of phones from rare luxuries to ubiquitous.

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

The largest statue of this convex, homogeneous object with just one stable and one unstable equilibrium point.

This statue honors one of Budapest's most beloved literary characters.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

Time stands still at this serene burial ground in the center of Budapest.

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

The plague quarantine island home to the alleged "Vampire of Venice."

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

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

A hospital where antique dolls are given new life.