The Naha Stone is a large volcanic rock located in Hilo, Hawaii. The stone was used in the cultural traditions of Native Hawaiians, and many legends surround it.  
The Naha Stone originated from Mount Waialeale on the Hawaiian island of Kauai.  It was found on the banks of the Wailua River before being moved via a double canoe to Hilo, where it became a symbol of the Naha Clan.
The stone was used to prove the legitimacy of the bloodline of any claiming to be of the Naha Clan. When a boy was born, he was placed on top of the slab of rock. If he remained silent, he was considered to be one of the members of the Naha. If he cried out, he would be cast out.  The Naha Stone was considered sacred, and only members of the Naha Clan were permitted to move it.
A legend existed that if one were to overturn the stone, that man would be granted the power to unify all of Hawaii. King Kamehameha, the eventual conqueror of the Hawaiian Islands, was said to have been influenced by this legend. Some sources  state that he was able to move the stone at the age of 14, after a series of failed attempts.  
The stone was relocated to the front of the Hilo Public Library in 1952, where it remains today.