14. Crater Lake – Oregon
Crater Lake, formed by a collapsed volcano, is one of the most stunning and mysterious lakes in the U.S. Its deep, intense blue waters remain incredibly clear, as no rivers flow in or out. A boat ride to Wizard Island offers an opportunity to hike or relax by the shore. The island's volcanic landscape is as captivating as the lake itself, with steep trails that require extra caution.
Whether you're exploring the island or simply enjoying the serene beauty of the lake, Crater Lake is a must-see natural wonder. Be prepared for a rugged adventure, and always take care on the challenging paths.