A moat full of crocodiles, rocks and boiling oil – when fortresses guarded Asia’s vital places, and nine that have survived to this day

• Carp or crocodiles? The occupants of moats around the fortresses of Hiroshima and Agra, India, tell their own story. They are among nine in Asia you should see
• Some are spectacularly situated, like Jiayuguan Fortress at the western end of the Great Wall of China, others have intriguing histories, such as Fort Belgica