The districts of the Western Ghats and the southern districts of the state have popular eco-tourism locations including Kudremukh, Madikeri and Agumbe. Karnataka has 25 wildlife sanctuaries and five national parks. Popular among them are Bandipura National Park, Bannerghatta National Park and Nagarhole National Park. The ruins of the Vijayanagara Empire at Hampi and the monuments of Pattadakal are on the list of UNESCO's World Heritage Sites. The cave temples at Badami and the rock-cut temples at Aihole representing the Badami Chalukyan style of architecture are also popular tourist destinations. The Hoysala temples at Beluru and Halebidu, which were built with Chloritic schist (soapstone) are proposed UNESCO World Heritage sites. The Gol Gumbaz and Ibrahim Rauza are famous examples of the Deccan Sultanate style of architecture. The monolith of Gomateshwara Bahubali at Shravanabelagola is the tallest sculpted monolith in the world, attracting tens of thousands of pilgrims during the Mahamastakabhisheka festival.