Kathmandu Valley packs an unusual density of world-class sights into a small area, so prioritizing matters on a short trip. Swayambhunath Stupa and Boudhanath Stupa offer two distinct faces of Tibetan Buddhist devotion, one perched above the city, the other anchoring a vast pilgrim circuit at ground level. Kathmandu Durbar Square and Bhaktapur Durbar Square reveal the valley's Newar architectural legacy, while Pashupatinath Temple gives an unfiltered look at Hindu cremation rites along the Bagmati River. Round things out with a wander through Thamel and a sunrise trek to Nagarkot for mountain views, and you've covered spirituality, history, and scenery without wasting a single day.