Which secrets are behind those mighty buildings?

Holy Shrine of the Mnajdra temple with peculiar ornamentation

The temple of Mnajdra with an eye-catching hole in the front side and in the background the little island Fifla

It seems quite clear that the former inhabitants of Malta had very deliberately chosen the places for their temples. The temples form an integrated whole with the surrounding landscape.
It is also very likely that the alignment with the movements of the sun and the moon was of importance!