England, Kent, Denge, 20ft and 30ft Experimental Sound Mirrors built in 1928 and 1930, precursor to RADAR, at Greatstone.

England, Kent, Denge, 20ft Experimental Sound Mirror built in 1928, precursor to RADAR, at Greatstone.

England, Kent, Denge, 200ft Experimental Sound Mirror built in 1930, precursor to RADAR, at Greatstone.

England, Kent, Denge, 20ft Experimental Sound Mirror built in 1928, precursor to RADAR, at Greatstone.

England, Kent, Denge, 30ft Experimental Sound Mirror built in 1930, precursor to RADAR, at Greatstone.

Italy, Emilia Romagna, Bologna, The Due Torri or Two Towers famous for leaning, Asinelli and Garisenda Towers.

Italy, Liguria, Cinque Terre, Monterosso al Mare, The Aurora Tower a 16th century defence structure against pirates with Ligurian Sea behind.

Scotland, Perthshire, Blair Castle, Piper in traditional Scottish outfit playing the bagpipes beside a cannon at the castle.

Scotland, Inverness-shire, Urquhart Castle with Loch Ness in the background.

Scotland, Ross and Cromarty, Eilean Donan Castle with its reflection in Loch Alsh.

Scotland, Ross and Cromarty, Eilean Donan Castle, evening view looking out towards Loch Alsh.

Scotland, Ross and Cromarty, Eilean Donan Castle.