The correct pairs regarding famous Buddhist shrines and their locations are 1 and 3. The Tabo Monastery, located in the Spiti Valley of Himachal Pradesh, is known for its rich history and ancient murals, often referred to as the 'Ajanta of the Himalayas.' Similarly, the Alchi Temple Complex, situated in Ladakh, is celebrated for its well-preserved Buddhist artwork and architecture, showcasing the influence of Indian and Tibetan styles. However, Lhotsava Lhakhang is inaccurately placed, as it is actually located in the Zanskar Valley but is not a recognized traditional site in the same context as the others. This distinction is essential in understanding the cultural heritage and geographical distribution of Buddhist monuments in India, relevant for UPSC examinations focusing on India's historical and cultural landscape.