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

Every Tuesday, students let off steam by screaming into the night air.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

The scars of a remarkably organized public protest to save 13 elm trees are still visible in this Stockholm park.

Frequent fliers welcome in this airplane hotel.

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

The single richest source of elemental discoveries in the world.

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

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

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

This Stockholm light tower can be controlled by anyone with a smartphone.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

A spectacular cave and a beguiling lake.

English Protestants once criticized this enormous private chapel for being too ornate.

This 600-year-old tower was built as a comfy residence for cherished pigeons.

This lonely metal cross may hint at the true location of a medieval showdown between Christian and Pagan kingdoms.

The undercroft is a spectacular example of medieval Cistercian architecture.

An enigmatic natural rock formation with a manmade passage cut through the center.

The ancestral home of beloved English poet Lord Byron has a bizarre history.

A Swedish farm is the world's only producer of the rare, creamy delicacy that is moose cheese.

This legendary dessert was served to Nobel laureates for decades.

The world's largest model of our planetary system.