Blue Hole (New Jersey)
The Blue Hole is located in the Pinelands of Monroe Township, Gloucester County, New Jersey and Winslow Township, Camden County, New Jersey. It is a clear blue body of water situated in the middle of a dense forest, with many similar such lakes in its immediate vicinity. The water has warm and cold spots, averaging 58 to 60 degrees Fahrenheit. The color is very unusual, as most lakes and ponds in the area are brownish due to large deposits of bog iron and the presence of tannic acid. The Blue Hole is circular and about across. In the 1930s, the Blue Hole was a popular party and swimming spot. A wooden footbridge over the Great Egg Harbor River that once made the Hole easily accessible was wiped out by a storm in the 1960s; now it can only be reached on foot.
Macarthur, New South Wales
Mushroom Tunnel is located just off the Remembrance Driveway (Old Hume Highway) heading towards Tahmoor and was built in 1867. It is considered one of the earliest pre-Federation railway tunnels in New South Wales. In 1919 the 65 metre long tunnel fell into disuse when a new railway deviation was built. The tunnel then served as a mushroom farm and ammunition storage facility during the war years. Currently the tunnel is empty although it is popular with ghost-hunters due to many local folk tales claiming that it is haunted. Subsequently it has been featured by both print and television media.Thirlmere Lakes National Park is part of the Blue Mountains Heritage Area in which the park consists of 5 important freshwaters lakes that are abundant in waterbirds and native reeds. The lakes are among the last undisturbed lakes within the proximity of Sydney and are believed to have high ecosystem-related and environmental scientific value. ("For more information, see Thirlmere Lakes National Park".)