A slice of central Asia in the middle of Berlin.

This unique medieval artwork featuring the story of the Antichrist remained lost for decades.

In addition to showing films, this one-screen arthouse cinema from the late 1940s is a museum of old film equipment.

Legend has it this spring formed at the spot where a medieval Swedish king was killed.

Uppsala's adorable feline sign celebrates a popular children's book set in the Swedish city.

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

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

Sound travels strangely in this underground whispering gallery.

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

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

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

It houses the remains of a 17th-century version of the Titanic.

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

An abstract representation of weather in Sweden.

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.

A 130-year-old urinal is the oldest of Stockholm and perhaps all of Sweden.

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

A concrete mushroom that divided Stockholm residents for nearly a century.

Before this rocky hill was home to a chapel, it was used as a lookout by Romans and Moors.

After the owner of this Art Nouveau home died, it was turned into a museum displaying a lifetime dedicated to art.

Little-known artist couple chose a former silk factory as the location for a museum dedicated to their work and other avant-garde art.

A garden in Lisbon filled with giant porcelain creatures.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.