Roopkund, trek where every trekking lover wants to go. If you are a fan of trekking then you must have heard about the Roopkund and about the most mysterious lake in India. The hellfires are visible in this lake, this is why the lake of Roopkund is called the mysterious lake. During the cold days, the lake gets fully accumulated but when the snow melts in the heat, starts to show skeleton in the lake. It is also called a skeletal lake. Surrounded by glaciers and mountains from around, this lake is very famous for trekking. Every year hundreds of thousands of tourists arrive in the summer.