The parks and colonnades are Františkovy Lázně's real main sight. UNESCO's Great Spa Towns listing treats these landscapes as part of the cure: places for gentle exercise, drinking mineral water, meeting other visitors, and making health feel civilised.
The town's scale makes the experience easy. You can wander from pavilion to pavilion without traffic pressure or big-city noise, watching the same yellow facades and green lawns repeat until the whole place feels deliberately composed.