The Te Anau Glowworm Caves are a part of the limestone caves located on the western shore of Lake Te Anau. A part of the cavern is home to glowworms. This is one of the many reasons why the Te Anau Glowworm Caves is a popular tourist attraction near Anau. The geological age of the caves is more than 12,000 years. You can also enjoy the commercially operated tours of the water-filled caves.