Example image of eyePlorer eyePlorer map for 'Defensive wall': Fortification Atlantic Wall City Great Wall of China Hadrian's Wall Wall Masonry Topography City gate Tower Battlement Medieval fortification City-state Mesopotamia Sumer Uruk Jericho Proto-city Wall of Jericho West Bank Assyria Indus Valley Civilization Indus River Kot Diji Afghanistan Babylon Ishtar Gate Nebuchadnezzar II Sparta Mortar (masonry) Celts Oppidum Ancient Greece Cyclopean masonry Mycenae Mycenaean Greece Athens Long Walls Piraeus History of China Rammed earth Shang Dynasty Siege Tang Dynasty Warring States Period Ming Dynasty Qin Dynasty Pingyao Beijing Forbidden City