
In 2014 the Minoan Palatial Centres of Knossos, Phaistos, Malia, Zakros, and Kydonia were placed on the tentative list of UNESCO World Heritage sites. The description outlines their importance:
“The palatial centres played a vital part in the evolution, development and propagation of Minoan civilisation and marked the social transformation from the proto-urban communities of the Early Bronze Age to a multifaceted and hierarchical society. The political, social, economic and religious reorganisation, the transformation of private life, and the unprecedented cultural development that emerged from the gradual centralisation of power and the accumulation of wealth, were focussed on the palatial centres, each of which covered a large populated area of Crete.
The Minoan palatial centres stand out for their unique monumental architecture, with its complex internal organisation, which passed into ancient Greek memory as the “Labyrinth”. They constituted the administrative, economic and religious centres of a wider geographical area and housed multiple activities. They not only contained the residences of the rulers and the priesthood, but were home to a multitude of people: artisans (metalworkers, potters, weavers, etc.), merchants, scribes. Various events and contests were held around the palaces.”

By 2019 four of the palaces accounted for 1.1 million visits, with over 930,00 at Knossos itself. The Bronze Age sites of Mycenae and Tiryns in the Peloponnese account for just over 500,000 visitors (2019); they form part of a UNESCO World Heritage site.
Kato Zakro, the most remote of the four main palace centres, receives around 10,000 visitors a year. Mallia, next to a major resort, receives around 80,000 visitors a year, and Phaistos around 120,000.