The Céide Fields in Mayo are a remarkable Neolithic site situated on limestone and shale cliffs, 113 metres above the Atlantic Ocean. Dating back 6,000 years to around 4,000 BCE and thought to be the oldest field system in the world, visitors can explore impressive ancient monuments, including stone-walled fields, megalithic tombs and dwellings, plus enjoy spectacular views of the surrounding cliff tops, sea stacks and bays from the Visitor Centre's panoramic viewing platform.