Yes, it's Eilean Donan Castle in Scotland wich nearly everybody knows from the movie Highlander!
But warning: This is an invasion-map but the game is
A SIEGE where you have to protect your castle there woun't be much time for building an empire.
"Now for many years the clan MacKenzie lives on Eilean Donan (island of Donan). The brave soldiers haven't been besieged for a long time but there is no lacking of lust for battles in their veins.
One day when the fog over the Loch slowly clears the guards on the Keep recognize shadows outside the water. Suddenly from the land and the hills around the Loch warriors from the clan Fraser scream their war cry and begin to charge!"