The road trip from Leh to Srinagar can be done in one very long day's drive, but it is recommended to do it in two days with one night halfway in Kargil.
Start the road trip with the visit of Gurdwara Pathar Sahib, a highly sacred place for Sikhs that was built in the memory of Guru Nanak, the founder of Sikhism. A few kilometres further, you can stop at the mysterious Magnetic Hill as well as at Sangam, the confluence of Indus and Zanskar rivers.
On the first day, you could also take the opportunity to visit the main monasteries of the Indus valley: Basgo monastery, Likir monastery, Alchi monastery and Lamayuru monastery. Before arriving in Kargil, stop at Mulbek to see the wonderful 8-metre-high Chamba statue carved into a rock face. On the second day, go through Zoji La pass and Sonamarg before reaching Srinagar, the capital of Kashmir.
Choose if you want to do this Leh to Srinagar road trip in one or two days and if you want to visit the monasteries of the Indus valley on the way: