One of the plausible perceptions about safe and generally optimal geotechnical structure, leads to the conclusion that its success is supported by four columns. The first column relies on the understanding of natural sciences such as Geology, Engineering Geology and Hydrogeology on one side, and on the understanding of Mechanics, Theory of Elasticity on the other side. The second column relies on the application of existing findings on the behaviour of soils and rocks under different stress-strain states – we are speaking about support from Soil Mechanics and Rock Mechanics. The third column relies on the combination of the theoretical findings with practical technologies during execution of Foundation Engineering and Und- ground Structures (Tunnelling). Finally the fourth column relies on a certain feeling of geological environment which Terzaghi (1959) denotes as “capacity for ju- ment” and he specifies that “this capacity can be gained only by years of contact with field conditions”. Theauthors are confident that the third column relevant to practical application should be strengthened about “Earth Structures”, about application on structures, which belong to the oldest engineering structures utilizing the fundamental str- tural material – soil. At the same time they believe that Earth Structures will est- lish their position in the near future, as it is gaining another interesting field which Earth Structures are also part of, namely the field of Environmental Geotechnics.