Dating back to 1900 BC, Knossos palace in Crete is the oldest building in Europe.
Image credit Loukas Hapsis
Knossos (also Cnossos, both pronounced /(kə)ˈnɒsɒs, -səs/; Ancient Greek: Κνωσός, romanized: Knōsós, pronounced [knoˈsos]; Linear B: Ko-no-so) is the largest Bronze Age archaeological site on Crete and has been called Europe’s oldest city.
Settled as early as the Neolithic period, the name Knossos survives from ancient Greek references to the major city of Crete. The palace of Knossos eventually became the ceremonial and political center of the Minoan civilization and culture. The palace was abandoned at some unknown time at the end of the Late Bronze Age, c. 1380–1100 BC; the reason is unknown, but one of the many disasters that befell the palace is generally put forward.
source Loukas Hapsis Photography