Italian Landscapes - Real and Imaginary Landscapes

Not all of Escher's landscapes faithfully reflect the physical world. For example, The Bridge (March 1930) borrows numerous elements from nature, but the work remains a fantasy, placing these elements in an imaginary framework.
(Escher, in Escher, 1989, p. 35).

On the other hand, some of his landscapes seem to be imaginary when in fact they are real representations of Italian architecture.