The Castle of Guimarães, often referred to as the birthplace of Portugal, stands as a prominent medieval fortress in the northern region of the country. Constructed in the 10th century under the orders of Mumadona Dias, it was strategically designed to defend the monastery against invasions by Moors and Norsemen. This granite stronghold, characterized by its pentagram-like walls and eight rectangular towers, encapsulates the early Gothic architectural style of the period. Its historical significance is further highlighted by its association with the origins of the Portuguese nation, marking it as a symbol of national identity and resilience.