Europe. Where with a small child?

We planned to visit Europe with my husband. Now our son is 4 years old. We are ready to fly with him on a journey. Which countries in Europe are worth a visit? What to see? We plan a trip in spring when the weather is warm

I really like traveling around Europe. This fall, I decided to arrange a family trip for us to visit Czech castles. We were in Prague and I fell in love with this city. If you are planning a relaxing trip with your child, I advise you to consider the option of a cruise vacation, for example, here https://prahatrip.cz/ I found Grand Cruise in Prague. It really was very beautiful and interesting. I advise you to try to look at Prague from a boat.