the eastern side of pleasant valley, on the slope of south mountain is the location of william park's ""park hall."" surveyed in 1731 it was the first land tract (legally) patented by a euromerican in what would eventually become washington county. pleasant valley is on the east side of elk ridge mountain. on the opposite (west side) of elk ridge is the historic kennedy farm where john brown and his followers stayed prior to their raid on nearby harpers ferry, west virginia. a handful of john brown's men escaped from the federal soldiers after the raid was defeated, and the escape route that these men took went north to pennsylvania following elk ridge and south mountain. the escaping raiders crossed from elk ridge mountain to south mountain in the area around rohrersville, to the north of pleasant valley. nestled at the foot of elk ridge on the west side of the lower valley is the community of yarrowsburg, named for early (1830's) free african-american residents aquilla and polly yarrow.