Kaimanawa wall - New Zealand

Near Lake Taupo in New Zealand is an enigmatic wall called the Kaimanawa wall. It faces north and consists of smooth, megalithic stone blocks with symmetrical corners.  The blocks form perfectly together and are completely flat at the end. They also go upwards and backwards in blocks and levels.  Many hypotheses flourish concerning the origins of its stone blocks, in particular, whether the structure is man-made or a unique natural formation.