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What is something you shouldnt miss if you are in Amsterdam and the same for Rome in your opinion?

For me it's the overall experience rather than a specific thing to see or do, but check out these couple of threads for more:

(and search the LeoTravel community - https://inleo.io/communities/hive-190432 - for others)

https://inleo.io/threads/view/adambarratt/re-leothreads-gnurzpec

https://inleo.io/threads/view/adambarratt/re-leothreads-4ds9mv1n