The longest Roman bridge was here https://en.m.wikipedia.org/wiki/Trajan%27s_Bridge

The one pillar left on the Serbian side; there is also one left on the Rumanian side

There are now Hydropower dams https://en.m.wikipedia.org/wiki/Iron_Gate_I_Hydroelectric_Power_Station which led to the being covered by water of an island that for many centuries was inhabited https://en.m.wikipedia.org/wiki/Ada_Kaleh

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