High angle view of Lake Como from Castle Vezio with Varenna and Gittana, Lombardy, Italian Lakes, Italy, Europe

The old town of Dubrovnik, UNESCO World Heritage Site, Croatia, Europe

St. Michaels Mount, cut off from Marazion at high tide, Cornwall, England, United Kingdom, Europe

The old stone causeway leading to St. Michaels Mount submerged by the incoming tide cutting it off from Marazion, Cornwall, England, United Kingdom, Europe

Roof tops of Florence, Italy, Tuscany, Europe

St. Michaels Mount, cut off from Marazion at high tide, Cornwall, England, United Kingdom, Europe

Blood Swept Lands and Seas of Red installation at The Tower of London marking 100 years since the First World War, Tower of London, UNESCO World Heritage Site, London, England, United Kingdom, Europe

Arundel Castle, original structure built in the 11th century, seat of Roger de Montgomery, most of stone castle built between 1133 and 1189, Arundel, West Sussex, England, United Kingdom, Europe

Arundel Castle, original structure built in the 11th century, seat of Roger de Montgomery, most of stone castle built between 1133 and 1189, Arundel, West Sussex, England, United Kingdom, Europe

Ruins of Montgomery Castle built in 1223 by Henry III on rock outcrop above town in The Marches, Welsh border region, Montgomery, Powys, Wales, United Kingdom, Europe

Tower of London, UNESCO World Heritage Site, and the River Thames in the evening, London, England, United Kingdom, Europe

Tower of London, UNESCO World Heritage Site, and the River Thames in the evening, London, England, United Kingdom, Europe

Castle house on St. Michael's Mount, Marazion, Cornwall, England, United Kingdom, Europe

The Tower of London, UNESCO World Heritage Site, London, England, Uninted Kingdom, Europe