(Photo: Juozas Šalna)This is the Bimmah Sinkhole, a natural swimming pool in Oman. As the name suggests, it’s formed by the erosion and collapse of a level of limestone in the Hawiyam Najm Park.[https://www....

Treehouses are usually in trees, but this house in the lake is pretty darned amazing even if the only trees are hidden away in the bridge. The Treehouse Solling of Germany sits about 14 feet above the water's surface, of...