The most imposing ancient building on mainland Europe is the megalithic construction of Menga, near the city Antequera in the south of Spain.

It is a sort of megalithic bunker, 25 metres in depth, 6 metres wide and about 2,5 metres high. It consists of about 30 standing megalith slabs that, along with 3 centre pillars support an enormous roof. This roof is made of huge megalithic plates; the largest is estimated to weigh more than 180 tons.

The construction is on top of a large hill. In fact it is embedded in the upper part of the hill. The entrance overlooks a vast area where in the distance a mountain shaped like a human face can be seen. It looks like the construction has been positioned precisely in this way so that one, when standing in the entrance, looks straight ahead to the mountain.
Tourist information explains that the construction was built in about 2500 BC. It was excavated in 1842 and human remains were found during this excavation. However, how old it is, who built it and for what purpose is unknown.
It seems certain that no human power was able to quarry, transport and position a 180 ton block uphill to the right place, and smoothing the bottom in order to create a perfectly flat ceiling after the bunker was finished. Again, tourist information suggests that the construction most probably served as a tomb.

The three pillars in the middle support the roof in an elegant way, as if the roof weighs almost nothing. The standing megalithic slabs neatly fit together with no space in between.
The construction is so extraordinary that only one conclusion can be justified: the builders were very intelligent, and had very advanced engineering technologies for designing, constructing and transporting at their disposal.