The scenic beauty along the road between Kalpa and Roghi is breathtaking. Vertical drop from road to river far below is 2800 meter from Rolla cliff..
Kalpa is around 240kms from Shimla.
From Delhi, Shimla is a comfortable 9hour drive (355kms via Ambala). From Shimla, route is Narkanda (64kms, an easy 2hr drive), then Rampur (another 73kms, 2 hours). From Rampur, you pass thru Jeori, Wang tu, Karcham (70kms). At Karcham, a right goes to Sangla valley, chitkul which is another awesome place to visit. Stay at Sangla and do a day visit to Chitkul from there or spend a day at Chitkul. Come back to Karcham. From Karcham take a left towards Recong Peo/Kalpa (35kms). At Recong Peo, Kalpa is 13kms straight uphill drive which is one of the most scenic drives I have ever taken.
If you are driving youself, take a night stop at Narkanda, around 420kms, 11 hours from delhi. 180 degree view of the 18000-20000 feet peaks from Kalpa will keep you occupied for days. If you are into trekking, discover places around Kalpa by asking the locals around.
Kalpa, Himachal Pradesh