The climb up the north tower of St. Peter's Cathedral is straightforward but not for everyone. Expect 150+ steep, narrow stone steps that feel longer than they are, especially near the top where the spiral tightens. At the summit you get solid 360-degree views over Geneva's rooftops, the lake, and the Jura mountains. It's exposed up there so it can be very windy; bring a jacket even in summer. The south tower is sometimes open too but offers less impressive sightlines. The cathedral floor itself is free and calm, while the underground archaeological site is interesting if you like history but can be skipped if you're short on time.
Best time to go is late spring or early autumn on a clear weekday morning. Summer weekends get crowded and hot inside the stairwell; winter offers fewer visitors but you'll be fighting icy wind on the platform. Expect to pay around 5-10 CHF for tower access. Skip the guided cathedral tour unless you're deeply into religious architecture; the self-guided tower climb is the part that actually feels rewarding.
One honest tip: wear shoes with decent grip. The steps are worn smooth in places and can be slippery. If you're claustrophobic or have knee issues, this is one to skip; the views from the lakeside or a café terrace are almost as good without the effort.
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