quite possibly one of my favorite places that i stayed at in europe in the last few years was the upside down borg cubes near rotterdam blak, an easy ride away by train from amsterdam central (you get there by train in 15 minutes from the airport) and you walk up the tube station and you can see them straight away, it kinda had it's own eco system of internal walls and doors, certainly a different way to look at the world in one of these, it's not for everyone but i could certainly see myself with some kind of server room mining cryptocoins up here -- quite cheap as well, around 100k euros i've seen certain ones on sale, easy to get in and out of the world via amsterdam airport too, maybe a future destination?