Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

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

Once home to one of the oldest banks in the world, this building is also where Marco Polo's famous travelogue was written.

Massive galleon from a box-office bomb docked in Genoa.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Centuries ago, red and white wine poured from the statue's breasts whenever a new Venetian ruler was elected.

An abstract representation of weather in Sweden.

Sweden's "good old days" painstakingly re-created in a model village.

Stockholm's deepest subway station is also a stunning ecological wonder.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Stockholm's narrowest alley is barely over two feet wide.

Stockholm's tiniest statue is of a small boy looking at the Moon.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

The world's largest model of our planetary system.

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Catacombs turned marketplace.

Something's watching you.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

A stunning 18th century pharmacy and medieval chemist's collection.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.