Medieval Castle of Alvor, which is also called Fort Alvor, considered one of the most significant monuments of military architecture.

The first building on the site - the Carthaginian fort - was built in the 7th century BC Rectangular shape fortress was built on a mountain top. The main gate of the fortress were built much later - in the Renaissance and going north. Entry into these gates guarded tower.

In 436, the fort was captured by the Carthaginian commander Hannibal, who renamed the fort into a fortress called Portush Annibalis. In the days of pre-Romanesque Alvor colonization it was an important commercial and trade center due to the fact that he had access to the sea. In 736, the town was conquered by the Muslims, but he continued to play the role of an important trade center. In 1189, King of Portugal Sancho I Alvor released by Muslims, but by war, the fort was destroyed. Unfortunately, in 1191 the Moors again occupied the region. In the XIII century Alvor was conquered by Muslims and in 1300 the castle was rebuilt by order of King Dinis Portuguese.

In the era of Christianity Alvor was one of the main towns in the Algarve, and the garrison, located in a small building of the fort a square shape, it has always been on the alert. Functions fort building fulfilled until about the XVII century. After the War of Independence of Portuguese military forces were deployed in the larger forts along the coast, and the castle was left in ruins. On the territory and outside the steel construction of the building.

In 1755 the castle was destroyed in the quake. Today, the fortress remained only some fragments of walls with battlements and towers.