>>>>> Tyre was well fortified, and the city-state included a walled island off the coast.

Unfortunately the sea castle is no longer due to centuries of silt accumulation on the causeway, effectively "merging" old tyre with mainland.

However, another walled island is in Sidon ("Saida"), nearby. It is quite a sight.

https://en.m.wikipedia.org/wiki/Sidon_Sea_Castle

Going back to Tyre - The hippodrome of Al Bass, with a bit of luck (ex: concert or wedding lightining placement, etc) would rival Baalbeck itself as the most extraordinary site in Lebanon