For a mind-bending experience, make sure to visit the Museum of Illusions. This interactive museum features optical illusions, holograms, and mind-blowing exhibits. It’s the perfect activity for a rainy or cold afternoon, and after you can grab a coffee in the café that looks like a drawing! 

It’s worth a stop, even just for an Instagram photo in the café! Admission is 12 Euros for an adult, which can be bought in the museum or online.