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Sunset point
Mall road
Gilbert trail
sunrise point
upper mall
manki point
Heritage market
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Will share a few tripoto links written by travellers pertaining to their travel to Kasauli. See if it is suitable for your travel. https://www.tripoto.com/himachal-pradesh/trips/kasauli-one-of-the-best-place-to-rejuvenate-yourself-58b711c82cb24 https://www.tripoto.com/india/trips/time-stands-still-in-kasauli-57f12b543d06e
Here are few more to explore
Krishna Bhavan mandir
Gilbert trail and
Gurkha fort.
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Christ Church
Monkey point
sunset point pine mall along with kasauli add Barog, solan nd dagshai jail museum in your plan as all places are very near
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