 The fort, built with large and heavy stones to create the tall towers (four bastions), thick walls and sturdy ramparts to withstand onslaught of wars that were fought against the Spanish invaders was instrumental in Uruguay evolving as an independent nation.It was built in pink granite stones, is surrounded by a moat, and has been fully restored.It is located in the town of Dieciocho de Julio, 8 km west of Chui along a winding hill road.