Hadrian's Gate

Hadrian's Gate is a memorial gate located in Antalya, Turkey, which was built in the name of the Roman emperor Hadrian, who visited the city in 130 CE. It was later incorporated in the walls that surround the city and harbor, of which it is the only remaining entrance gate today.The gate was rediscovered by the Irish hydrographer Francis Beaufort in 1817, while commanding on HMS Fridericksteen.

Source: Wikipedia