Photo: GetYourGuideThe Paradox Museum is a playful world of optical illusions and mind-bending rooms designed to be walked through, touched and above all photographed. Tilted chambers, an upside-down room and clever tricks of perspective make it a reliably fun couple of hours, particularly with children or a group. Charge your phone before you go, because you will take far more photos than you expect, and let the staff show you the best angles for the trickiest illusions.