The fortress of Angelokastro, or "angel Castle", is one of the most important architectural monuments of the Byzantine era in Greece. It is located on the highest peak of the coastline of Corfu in the northwestern part, near Paleokastritsa. Impregnable fortress, representing a well-fortified Acropolis, was one of the most important strategic fortifications of Byzantine Corfu and played an important role in the life of the island for many centuries. In peacetime it was also a center of trade.

Powerful fortification was built in the early 13th century in the period of the despot of Epirus. Most likely, the founder of Angelokastro was Michael I Komnenos Doukas (the founder of the Kingdom of Epirus), which is also called the angel Michael, though perhaps it was his son Michael II Komnenos Doukas.

In 1267, the fortress was captured by the Angevins. The manuscript, which confirms it is the oldest written source on the history of Angelokastro. In 1386, the castle became the property of the Venetian Republic, which was at that time a mighty sea power, and was used for the control of sea routes in the southern Adriatic and Ionian sea. In 1403 Genoese pirates tried to capture the castle, but were repulsed. Stood the fortress with success and the siege of the Turks in 1571. It was one of many attempts of the Ottoman Empire to seize the island of Corfu, which they never surrendered.

Today the fortress is open for visitors, but it is still under restoration and archaeological work. To our times there remained a small Church dedicated to the Archangel Michael and the chapel of Agia Kyriaki, in which are preserved frescoes of the 18th century. From the top of the fortress offers stunning panoramic views.