Harhoog - Credit: Wikimedia Commons
The Harhoog is a dolmen, a rectangular megalithic tomb from the Funnelbeaker culture, located near Keitum on the island of Sylt in Schleswig-Holstein, Germany.Ernst Sprockhoff. Atlas der Megalithgräber Deutschlands - Schleswig-Holstein. Rudolf Habelt Verlag, Bonn, 1966. Discovered in 1925, it was moved to the present site in 1954 when a new airport was developed. Read more on Wikipedia
Source: en.wikipedia.org