Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

This colorful statue welcomes visitors to a Barcelona park.

Once home to more than 50 displays of freshwater fish.

An alchemist's "magic door" stands in the middle of a Roman park.

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

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

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

It's always game time at Stockholm's only museum devoted solely to video games.

A scale model of the world's largest existing lensed telescope.

The center of Stockholm can be found along this quiet street.

A traveling Bronze Age sacrificial stone that was used to honor elves, fairies, and other woodland spirits.

This railroad track was so secretive that it was omitted from all maps.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

Although rarely used, there is still a hidden room for the royal family at the Stockholm central station.

The single richest source of elemental discoveries in the world.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

A 1:42 scale model of the world's second largest lensed telescope.

"Only the dead get off at Kymlinge."