the stunning Edinburgh Castle
Old town - 1)really "old" 2)It has preserved its medival plan and many Reformation-era buildings (lurve the building) 3)One end is closed by the castle and the main artery, the Royal Mile, actually made up of four distinct streets named Castlehill, the Lawnmarket, the High Street and the Canongate.
Edinburgh Old Town
The Royal Mile
The Royal Mile (right outside the Edinburgh Castle entrance)