Sure, there are worse things in life than cruising into Rome, Barcelona, or Stockholm and finding out that – due to a national holiday – several major attractions are closed. But when you’re on a cruise and have just one day to sightsee, not being able to try that amazing paella in Valencia that your co-worker recommended or see your favorite Picasso painting in Paris could be a major let down. To help you avoid disappointment, here are some of the major European holidays to note when it’s not business as usual.