Colchester Castle is a majestic Norman fortification located in the city of Colchester, Essex, in the United Kingdom. Built in the second half of the 11th century, it is one of the most significant historical monuments in the region and attracts lovers of medieval architecture and history from all over the world.

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The main pride of Colchester Castle is its keep—the central tower, which has been preserved almost in its original state. This structure is striking in its size and is considered the largest surviving Norman keep in Europe. Its massive walls and impressive dimensions allow one to imagine the scale of construction of that era and feel the spirit of the Middle Ages.
The uniqueness of the castle lies not only in its size but also in the history of its foundation. It was built on the foundations of the ancient Roman Temple of Claudius, making it a kind of bridge between two great eras. The height of the surviving part of the structure is about 23.5 meters, and today its walls house a museum whose exhibitions tell the rich history of Colchester, from Roman times to the Norman conquest.