Best places outside of US that you've visited?

My husband and I are trying to figure out where to vacation next year, so I thought I would see what y'all had to say. I would love to hear details about what your favorite thing about the country was, how the people were, how safe it felt, how easy it is to communicate with locals, ease of getting transportation, how expensive or affordable it was, how long you stayed, etc... Also anything that we definitely need to remember to not do if we go there.
Best places outside of US that you've visited?
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