Blue Hole (Castalia)
The Blue Hole is a fresh water pond located in Castalia, Erie County, Ohio, in the United States. From the 1920s to 1990 the Blue Hole was a tourist site, attracting 165,000 visitors annually at the height of its popularity, partly because of its location on State Route 269, about southwest of the Cedar Point amusement park in Sandusky, Ohio.
Blue Gum Forest, Blue Mountains
The Blue Gum Forest is a protected nature reserve located in the Grose Valley of the Blue Mountains, in Blue Mountains National Park, in New South Wales west of Sydney, southeastern Australia. It is one of the best-known bushwalking sites in Australia. As part of the Greater Blue Mountains, the forest is within the UNESCO World Heritage Site. The forest survived through the efforts of early Australian conservationists.