Buildings and structures completed in 1540

one of seven open Gates in Jerusalem's Old City Walls

fortress in Heraklion, Crete, Greece

castle in Kent, England, UK

artillery fort on the Calshot Spit, Hampshire, England, UK

Gargaon (Tai-Ahom:Tsé-hung;) is a historic city in Assam, India and served as the capital of the Ahom kingdom for many years. It was built by the Ahom king Suklenmung (Gargaiya Roja) in 1540. It lies 13 km east of present-day Sivasagar City, headquarters of the Sivasagar district. The palace structures were made of stone and wood. In 1747, Pramatta Singha, son of Rudra Singha, constructed a brick wall of about 5 km in length surrounding the Gargaon palace and the masonry gate leading to it to boost security.

fort on the island of Ternate in Maluku Islands, Indonesia