What is the fine-grained topic of the following text: Francis Younghusband and HW Tilman called the finest mountain scenery in the world, this pass was use frequently in the 14th century by Hunza and Nager people to ply polo in Kesar Shagarun near Askole. Only return the topic.
Francis Younghusband and HW Tilman's views on a historical pass used by Hunza and Nager people for polo in the 14th century.