| Lake Baikal is saturated with a lot of methane, so when the lake melts it forms a geometrically perfect circle. These circles appear every spring, the largest of them being more than 2 miles in diameter. They are so big that they cannot be seen from the ground, or even from the tops of the surrounding mountains, they are only visible from space. Strange, but no one has claimed that could be a landing platform for UFO. |