I lived and worked in Spain for a year and a half in my mid 20s. If not for my girlfriend (now wife) I might still be there.
Do you speak Spanish? How did you end up in Spain?
Yes, now. Although I was poor at it when I first went. I was pretty much fluent by the end. I've regressed a bit since being back (8 years and counting), but I can hold a conversation and probably even do business.
I ended up there after grad school where I met a professor who brought me in to do research on one of his grants. I was young, debt-free, unmarried, no house, no car. I didn't even have a dog. I could have moved anywhere, but this was the opportunity that presented itself. I could have stuck around to do a PhD there, but declined at returned to the US to be with my girlfriend, who was doing a doctorate herself. It was either stick in Spain and lose my girlfriend, or move back and see where it went with her. I'm married with two kids now, who we are raising bilingually. My wife is originally from Venezuela so she's a native speaker of both English and Spanish.
It was a formative experience and one that I would do all over again in a heartbeat. My wife and I have talked about moving abroad again (Switzerland or Panama the most likely candidates), but careers are tough to manage. I'm not sure either of us would have the job opportunities elsewhere in the same location that we have here in the US.