Great Blue Hole
The Great Blue Hole is a giant marine sinkhole off the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll from the mainland and Belize City. The hole is circular in shape, across and deep. It was formed during several episodes of quaternary glaciation when sea levels were much lower. Analysis of stalactites found in the Great Blue Hole shows that formation took place 153,000; 66,000; 60,000; and 15,000 years ago. As the ocean began to rise again, the cave was flooded. The Great Blue Hole is a part of the larger Belize Barrier Reef Reserve System, a World Heritage Site of the United Nations Educational, Scientific and Cultural Organization (UNESCO).
Sugar Hollow
Sugar Hollow is located in the Blue Ridge Mountains of western Albemarle County, Virginia, United States. It is defined by the north and south forks of Moorman's River which drain into a reservoir built in 1947, that supplies water for the City of Charlottesville, Virginia. The Appalachian Trail runs north and south along the upper reaches of this beautiful natural area.