Dolmen of Guadalperal (monument) built

3999 BCE.

Shown on the map at 39.836°, -5.404°.

The Dolmen of Guadalperal, also known as the Treasure of Guadalperal and as the Spanish Stonehenge for its resemblance to the English Stonehenge, is a megalithic monument dating from around 3000 BC. It is located in Peraleda de la Mata, a town in the region of Campo Arañuelo in eastern Extremadura, Spain. The monument is within the Valdecañas reservoir in the Tagus River and is only visible when the water level allows it.

Text from the Wikipedia article Dolmen of Guadalperal, licensed CC BY-SA 4.0.

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