The gold-standard Spiti circuit — enter high via Atal Tunnel, descend gently through Kinnaur.
Overnight or early-morning drive to Manali. Rest and acclimatise.
Short easy day through Atal Tunnel into Lahaul. Sissu waterfall, Sissu lake.
Big day: Gramphu → Batal → Kunzum Pass (4,551 m) → Losar → Kaza. Chandratal detour possible.
Key monastery, Kibber (world's highest motorable village), Chicham bridge, Hikkim (highest post office).
Tabo monastery (millennium-old murals), Nako lake, drive to Kalpa in Kinnaur.
Sangla + Chitkul detour (last Indian village) morning. Drive to Sarahan for Bhimakali temple.
Rampur → Narkanda → Shimla. Evening at Mall Road.
Highway drop back to Delhi.