The Skystone is an andesite glacial erratic boulder in Bonney Lake, Washington.

[2][3] The stone may have astronomical significance to the Puyallup tribe of Native Americans.

The holes point in the direction of Polaris, Sirius, the Little Dipper, and Orion.

[4] Some of the holes align with the sun's position on the solstices,[2] which may have allowed Native Americans to predict the changing of seasons.

[4] The stone is about one mile south of the former Naches Trail, and was apparently rediscovered when a suburban housing development was begun in 1999.