Jaw-dropping photo of the Alpstein, Eastern Switzerland. The Alpstein are a subgroup of the Appenzell Alps in Switzerland. The Alpstein massif is in Appenzell Innerrhoden, Appenzell Ausserrhoden and St. Photo: Urban Thaler on
Lake Retba In Senegal Looks Like A Giant Strawberry Milkshake. That's because the blood red colour is caused by high levels of algae due to high salt content - with some areas containing up to 40 per cent of it.