I still make the effort to visit overseas facilities. Have been to Amsterdam, Paris CDG, CFMU Brussels, and Chicago Tower and TRACON (mindblowing!). Have learned worthwhile information in all locations, and it is always interesting to see different types of kit. During my short career in ATSSD I also visited a wide selection of ATC facilities in the UK. I think it helps to develop a broader outlook of other folk's problems, and not be so parochial as many air traffickers are unfortunately. Always a joy to chat to fellow controllers; wherever they are in the world, they all seem to be on exactly the same wavelength!