I know what museums are.
Environment?
Architecture? Parks? River or lake? Churches? City walks?
What about dining? Neighborhoods? Shops? Bakeries? Markets? Music? Heritage or, as one says in France, Patrimoine.
As for museums … there are many greats. Louvre in Paris, Uffizi in Florence, Vatican Museums, Prado in Madrid, Kunthistoriches in Vienna, British Museum in London. (I’ve not been to Amsterdam, but I can hear some of your nominations)
What about Maison Balzac or the Jewish History and Art Museum or Petit Palais in Paris, church frescoes in Florence at Santa Trinita, Santa Maria Novella and Santa Maria del Carmine or statuary and architecture at San Lorenzo in Florence, the Thyssen in Madrid or Sir John Soane’s House in London?
Smaller (and not so small) gems elsewhere … Mucha Museum in Prague, Fundacio Joan Miro in Barcelona, Rheinisches Landesmuseum in Trier, Museum of Naive Art in Zagreb, Lecce’s Castromediano Museo, and the Oxford Museum of Natural History.
Sure, for me museums are definitely part of the mix - in Europe and also at home in the US or in neighboring Canada and elsewhere. But only part of the mix.
LATE NOTE. HK and CWsocial are absolutely right to mention special exhibitions. I don’t choose where to go because of them, but once I choose where to go, I look to see what special exhibitions are happening ,,, whether in Paris (Sarah Bernhardt, Monet’s brother and John Singer Sargent) or closer to home in San Francisco (Rivera & Kahlo and Manet & Morisot).