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The Pedras de abalar, Galician for "oscillating stones", are several large stones that can easily be moved by a person or the wind in Galicia, Spain. There are many versions found throughout the world; in English these are called rocking stones, or logan stones.
One of these is in Muxía, the "Pedra da Barca". These are large stones that are balanced on a point, so that they can be moved back and forth easily, or even wiggle in response to the wind. These were used at one time to determine the guilt or innocence of those accused of serious crimes.
Other pedra de abalar include the "Pena da Conga" in Melide, and the "Castro do Faro" in O Porriño.
Pedras de Abalar in Galicia:
References
Pedras de abalar Wikipedia(Text) CC BY-SA