Sarkel is an ancient fortress located in present-day Russia, built by the Khazars in the 9th century. It served as a strategic stronghold for trade and defense along the Volga River. The fortress played a significant role in the interactions between the Khazars, Byzantines, and other neighboring civilizations.
They used a hill for a fortress (acropolis acro = topmost, polis = city) in the middle of their farming land, on which they could take refuge when invaders came along. Then a city would build up around the fortress and often walls around the buildings to protect them too.
The fortress can also be called a citadel. Hope this helps :)
The American colonel who captured a key British fortress at Yorktown was Colonel Thomas Knowlton. He served as an aide to General George Washington and played a significant role in the American Revolutionary War. Knowlton led the Knowlton's Rangers, one of the first American military intelligence units, and his leadership contributed to the successful siege of Yorktown in 1781, which ultimately led to British surrender.
The leader that built the Antonia Fortress in Jerusalem was Herod the Great. The fortress was used as a military barracks.
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The Kuelap fortress contains over four hundred buildings. The exact number of buildings located in Kuelap fortress is unknown. But the number is over four hundred.
A brick bathhouse, storage buildings, and government buildings, and running water.
A large fort; a set of buildings defended by walls and battlements.
The acropolis
There are many different names for fortified buildings. Some of them include enceinte, bulwark, citadel, fortress, stronghold and bastion.
It is known as the Kremlin. Incidentally, Kremlin means a "fortress inside a city."
Sarkel is an ancient fortress located in present-day Russia, built by the Khazars in the 9th century. It served as a strategic stronghold for trade and defense along the Volga River. The fortress played a significant role in the interactions between the Khazars, Byzantines, and other neighboring civilizations.
tower of London ....
perhaps you mean the 'flying fortress' a B17 bomber
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Boeing B17