The Dolmen of Menga is one of the largest megalithic structures in Europe, built around 3750–3650 BCE from enormous slabs of local limestone — the largest weighs an estimated 180 tonnes. It is a covered passage tomb: you walk into a long corridor roofed by massive capstones and enter a roughly oval chamber at the end. Standing inside it, with the weight of those stones above you, is genuinely arresting.
The dolmen sits in an archaeological park just north of Antequera, together with the Dolmen de Viera and the Tholos de El Romeral. All three are UNESCO World Heritage listed. The site museum provides good context on the Neolithic and Chalcolithic cultures that built them. Entry is free for EU citizens; small charge for others.