If your school was decorated with trippy graffiti, served ambrosial coffee, and was frequented by mimes, it might have been similar to this groovy cafe.

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

Early habitat dioramas and home of the elusive gaff, the skvader.

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

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

The internet as provided by a James Bond villain.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

A surreal museum of extraordinary industrial objects.

This man-made mound monument was built out of soil from all across the Polish empire.

A slice of central Asia in the middle of Berlin.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

The highest peak in Northern Ireland is topped with a stone tower and haunting burial mounds.

An 1814 castle that hosts an exhibit of "explorabilia".

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.