Also referred to as the Rohtang Tunnel, Atal Tunnel is a horseshoe-shaped highway tunnel that connects Manali and the Lahaul-Spiti valley, reducing the time taken by around 4-5 hours. Named after the former prime minister Atal Bihari Vajpayee, the tunnel is the world’s longest one above 10,000 feet and is constructed in the Pir Panjal ranges, under the Rohtang Pass.