Formed over 30 million years ago there are two levels to the Waitomo Glowworm Caves which are 16 metres apart. The upper level is dry and includes the entrance to the cave, and formations known as the Catacombs, the Pipe Organ and the Banquet Chamber. The lower level consists of stream passages and the Cathedral.
The Cathedral is on the lower level of the Waitomo Glowworm Caves and, at 18 metres in height, this is the largest cavern. It is world-renowned for its superb acoustics, which are due to the enclosed shape and rough surface. Many famous singers and choirs have performed here and have been delighted with the purity of the sound.
The Tomo is one of the wonders of Waitomo, it is a 16 metre vertical limestone shaft which marks the course of an ancient waterfall which today on flows during heavy rains. The dramatic vertical drop is carefully lighted to show the scalloped walls and the layers of limestone. The Tomo was the last feature of the cave to be formed and links the upper level to the Waitomo River below.