Originally built in 1895 by Colonel A.H.B Hume of the Royal Engineers, St. Mary's Church served the spiritual needs of the British officers and their families stationed in Lansdowne. However, the church fell into disuse after 1947. It was later restored by the Garhwal Rifles Regimental Centre and reopened as a museum in 1983. The museum showcases pre-independence era photographs and information about the regiment and the history of Lansdowne. The restoration efforts have preserved the church's original charm, making it a significant historical landmark.