A very interesting tour around the walled city which is crammed with historical buildings and churches. I’d highly recommend getting a guide - we had guides on a bicycle and we sat in the sidecar. They were very knowledgeable and well worth the money - we could have probably done it diy, but to be honest even with the guides cycling us and focusing us on key areas, it took 3 hours.

This is a huge complex - spread over 64 hectares that you will take over a day if you want to visit every monument. So start early in the morning and hire a guide to tell you the the significance of every monument. Most of them are built as barracks or garrisons. Fort Santiago is the biggest and the best which now houses a museum explaining the story of Philipines independence. Highly recommended.

This was the Spanish heart of Manila. The walls are largely preserved. Some nice monuments inside. I took a bike ride with a guide who was knowledgeable and useful.