Time Out says
Bern Cathedral is a Gothic edifice at the heart of the Old Town with a bell tower offering views over to the Bernese Oberland.
Even if you’re local, a visit to Bern Cathedral is almost always a pleasant diversion as long as you have a good head for heights. The imposing Gothic Bern Münster dates from 1421, and the bell tower winds skywards up 254 steps that shouldn’t be attempted unless you’re in good physical health. Once you get to the top, though, you’re rewarded by immense views of the Bernese Oberland, with Eiger, Monch and Jungfrau all visible on a clear day. It's a good way to orientate yourself within the city, as the loop of the River Aare and the limit of the UNESCO heritage area are easily discernible. If you don’t succumb to dizziness on the way down, take some time to enjoy the peaceful beauty of the cathedral’s interior amid the soaring ceilings and ornate stained glass.