I've managed to combine professional development and travel a few times. For example, I went on a Fulbright Exchange to Scotland where I taught in a Scottish primary school and learned first hand about their educational system. I also went to the Amazon and learned about biodiversity from research professors and best practices in science instruction from curriculum specialists there. Both trips provided huge amounts of personal and professional growth and I came back to teaching refreshed and inspired. I went on these adventures on my own initiative, but what could happen if a district actively encouraged teams of teachers to go on PD adventures together? I can imagine all kinds of positive possibilities and benefits for teachers and the school communities where they teach!