In the 1972 travelogue Kulu: The End of the Habitable World, Penelope Chetwode recounts her mule trek from Shimla to Rohtang (13,050 feet) over the Jalori Pass (10,300 feet), a detour to Khir Ganga in the Parvati Valley, and eventual return to Shimla across Bashleo Pass (10,800 feet). This chronicle of an arduous albeit adventurous journey, undertaken in 1963, unveiled for curious travellers the less explored regions of the Inner and Outer Seraj Valley. Today, the valley's Great Himalayan National Park, a UNESCO World Heritage Site, is a huge draw.