I do think it really depends where you go. I traveled to India for 2 months in 2004 knowing nobody when I went (but leaving having made the acquaintance of several people) and I still think about this trip almost 20 years later.

Another European country with churches and castles (I live in Germany and used to live in Austria)? I probably don't need to go there unless I have someone to visit. Going to India was like visiting another world & it truly enriched my life (or I wouldn't still be thinking about it 20 years later!), I think there are plenty other places like that - might not be that easy to find which ones are the best fit for you though!