 Complete the following phrase:  Leaning against two hills, one of which is overlooked by the fortress of the Neokastro, the town of Pylos faces the bay of Navarino. Pylos preserves many houses from the 19th century. These are built of stone, with typical Messenian architecture and surrounded by spacious courtyards and gardens. They are built mainly between narrow streets, generally symmetrical, and according to the original urban plan established by French military engineers of the 