Blue Hole (Big Pine Key)
The Blue Hole is an attraction on the island of Big Pine Key in the Florida Keys. It is an abandoned rock quarry that was used for nearby road fills and Henry Flagler's Overseas Railroad. The water it contains is mostly fresh and is used by various wildlife in the area, such as birds, snakes, alligators, key deer and green iguanas. It is part of the National Key Deer Refuge.
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".)