sentences:  The reservoir was begun in 1837, after cholera epidemics swept Leeds in 1832, and was covered over in 1863.Two stone lodges were built alongside the reservoir in 1840; one still stands (behind the gardener's cottage near the Victoria Monument); the other was converted into an observatory in 1906, and subsequently demolished.In 1858 Queen Victoria, in Leeds for the opening of the Town Hall, visited the Moor and listened to 26,000 Sunday School children sing hymns as the teachers tried to control them using placards with instructions such as 'Prepare to Cheer', 'Sing', 'Silence', and 'Dismiss'.