It really depends on where you start from. If you are in the Interlaken area, then the Jungfraujoch is closest. It is expensive and all day. If you are in the Lucerne area, Mt Titlis is lovely too. Take the train to Engelberg and the cable cars (the final one is rotating) to the top. It isn't as high but can be done in half a day if time is short. You will see and walk in snow on Mt Titlis.
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