Knossos is the largest Bronze Age archaeological site on Crete island and has been called Europe's oldest city. The settlement was established well before 2000 BC and was destroyed, most likely by fire (though some claim a tsunami) around 1700 BC.
The Minoan palace is the main site of interest at Knossos, an important city in antiquity, which was inhabited continuously from the Neolithic period until the 5th century AD. The palace was built on the Kephala hill and had easy access to the sea and the Cretan interior. According to tradition, it was the seat of the wise king Minos. The Palace of Knossos is connected with thrilling legends, such as the myth of the Labyrinth, with the Minotaur, and the story of Daidalos and Ikaros.
The palace of Knossos was undoubtedly the ceremonial and political centre of the Minoan civilization and culture. It appears as a maze of workrooms, living spaces, and storerooms close to a central square. An approximate graphic view of some aspects of Cretan life in the Bronze Age is provided by restorations of the palace's indoor and outdoor murals, as it is also by the decorative motifs of the pottery and the insignia on the seals and sealings.
The palace was abandoned at some unknown time at the end of the Late Bronze Age, c. 1380–1100 BC. The occasion is not known for certain, but one of the many disasters that befell the palace is generally put forward. The hill was never again a settlement or civic site, although squatters may have used it for a time.
However, fieldwork in 2015 revealed that during the early Iron Age, Knossos was rich in imports and was nearly three times larger than indicated by earlier excavations. Whilst archaeologists had previously believed that the city had declined in the wake of a socio-political collapse around 1200 BC, the work of the Knossos Urban Landscape Project found that the city had prospered instead.
Except for periods of abandonment, other cities were founded in the immediate vicinity, such as the Roman colony, and a Hellenistic Greek precedent. The population shifted to the new town of Chandax (modern Heraklion) during the 9th century AD. By the 13th century, it was called Makruteikhos 'Long Wall'; the bishops of Gortyn continued to call themselves Bishops of Knossos until the 19th century. Today, the name is used only for the archaeological site now situated in the expanding suburbs of Heraklion.
In the first palace period around 2000 BC the urban area reached a size of up to 18,000 people. In its peak the Palace and the surrounding city boasted a population of 100,000 people shortly after 1700 BC.
Castel del Monte, located in the municipality of Andria, rises on a rocky hill dominating the surrounding countryside of the Murgia region. A unique piece of medieval architecture, it was completed in 1240. The castle’s location, its perfect octagonal shape, as well as the mathematical and astronomical precision of its layout all reflect the broad education and cultural vision of its founder, Emperor Frederick II.
As a leader of modern humanism, the Germanic Emperor brought scholars together in his court from throughout the Mediterranean, combining Eastern and Western traditions. The castle’s unique design, an octagonal plan with octagonal towers at each angle, represents a search for perfection. Interior features reflect Eastern influences, such as the innovative hydraulic installation used by Frederick II for bathing in accord to the typical Arabic customs.
The site is of outstanding universal value in its formal perfection and its harmonious blending of cultural elements from northern Europe, the Muslim world and classical antiquity. Castel del Monte is a unique masterpiece of medieval architecture, reflecting the humanist ideas of its founder, Frederick II of Hohenstaufen.