Their writing is called runes
One success in their mobility is that they managed to build ships, both with and without sails. These ships could take them all the way to the Mediterranean.
In the city of Stockholm on the island of Skeppsholmen there is actually a place where you can take a class to learn how to build your own boat, and when we took a stroll there last weekend they obviously had a viking theme going!
It's amazing how they managed to build these boats, and we can only guess how many hours is spent on each boat.