Qalat al-Bahrain #

Qalat al-Bahrain
Licensed under PD

Walls of the historic Qalat al-Bahrain (Fortress of Bahrain), which is the largest and most ancient historical site in the country.

It was an important center of the Dilmun Civilization (2nd and 1st millennia B.C.); in later periods, it served as a trading and military outpost.