Boudhanath Stupa, one of the largest spherical stupas in Nepal, dominates the Kathmandu skyline and is a UNESCO World Heritage site. A major pilgrimage site for Tibetan Buddhists and locals alike, it offers a deeply spiritual and culturally rich experience. Accessibility is generally good, though the area can get crowded, especially during festivals. Solo exploration is easily manageable, but guided tours can provide deeper insights into the Stupa's history and significance. There are no seasonal restrictions, but the atmosphere is particularly vibrant during Tibetan New Year (Losar). Expect to spend around 2-3 hours exploring the area, including the surrounding monasteries and shops. Entrance fees are required for foreigners, costing approximately a few US dollars. Be mindful of local customs and dress modestly.