I have visited this group of WHS several times. My favourite has to be Ggantija Temples in Gozo because of their unique shape. The Hagar Qim Temples in Malta were also my personal favourite because of its alignment with the sun. However, in recent years, a controversial tent-like structure has been built to protect the megalithic temple from sea erosion, rain and direct sunlight. IMO this is too much of an eyesore compared to how the temple looked without this modern monster. Apart from this, the sun played an important role in the construction of these temples that are older than the Pyramid of Giza or Stonehenge!