Unknown Sister, Castle Valley, Utah: ascent by Larry Hamilton and Tom Ruwitch. We climbed this small tower near Sister Superior in March 1972, as a warm-up for an attempt on Candlestick Tower. Ours was the first ascent of today's usual route and, apparently, of the tower itself. I placed a Star bolt to reach the start of the obvious west-side crack. "Unknown Sister" is the name Bjornstad's guidebook gives to the distinctive tower at right in the photo below, showing the Sister Superior group from the east. Larry Hamilton photos.
We encountered no pin scars or evidence of previous climbers on the route or on the pristine summit (narrow center platform in the right photo below; the black towers on the right side of that picture are North Sister and Sister Superior).
We had no concept of the "convent" theme, and just thought of our climb as "Pinnacle X" at the time. At left below, Ruwitch jumars the widening crack below the summit. At right, he gets out the bolt kit to make a rappel anchor.
Hamilton relaxes on the summit (below left); Ruwitch places a 3/8" Star bolt for the rappel (below right).
Below: Ruwitch on the south-face rappel.
Larry Hamilton climbing page