Soliciting Destination recommendations

Hi, looking for ideas on where to retire. Open to any and all. Here's a bit about us.

40M (US Citizen) + 43F (US + El Salvador Citizen)

Destinations we have enjoyed include England and Italy.

Looking to retire in the next 10 years with ~$3M nest egg.

Would like to be in proximity to a major city, but not in an urban environment. Good healthcare and infrastructure would also be important. Bonus for relatively easy immigration process....

What are your thoughts?