Mortar is lacking from large Neolithic fortifications and megalithic structures.
What are megalithic structures?
In prehistoric art, a megalith is a large, often undressed stone, that has been used in the construction of various types of Neolithic, Chalcolithic or Bronze Age monuments, during the period 4500-1000 BCE.
Also known as petroforms, these monuments can consist of just one stone (Menhir), most megalithic monuments consist of a number of stones, which are fitted together without the use of mortar or cement.
This form of rock art was used in ceremonial or ritualistic structures (Stonehenge stone circle, monolithic Moai of Easter Island), single or multiple tombs (Newgrange, Knowth), sanctuaries (Gobekli Tepe), and several other types of monumental architecture.
The construction and alignment of these prehistoric structures could be highly sophisticated: specific rock shapes were often hewn to meet specific design requirements, while the buildings themselves were sometimes positioned in relation to the stars or the solstice.
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