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The southern walls of Windsor Castle, with the Round Tower within, the castle has been home to Royalty for 900 years, Windsor, Berkshire, England, UK

The Round Tower and gardens in Windsor Castle, home to Royalty for 900 years, Windsor, Berkshire, England, UK

Shenzhen Development Centre, Shenzhen City, Special Economic Zone on the border with Hong Kong, China

Sultan Qaboos Grand Mosque, built in 2001, with a prayer hall accommodating 20000, Ghubrah, Muscat, Oman, Middle East

Panoramic view of tufa formations, Valley of the Fairy Chimneys (Pasabag), near Zelve, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Statue of the Virgin, Round tower, 30m tall, of St. Declan's cathedral, dating from 12th century, Ardmore, County Waterford, Munster, Republic of Ireland (Eire), Europe

Old lighthouse, Deep Water Harbour, St. Johns, Antigua Island, Lesser Antilles, West Indies, Caribbean, Central America

Doonagore Castle between the village of Doolin and the Cliffs of Moher on the County Clare coast, County Clare, Munster, Republic of Ireland, Europe

Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe

Rumeli Hisari (Fortress of Europe or Rumelihisari), elevated view from the Bosphorus Strait, Hisarustu, Istanbul, Turkey, Europe

Overview of the city from an iron balcony of the Round Tower (Rundetaarn), Copenhagen, Denmark, Europe

Befreiungshalle (Hall of Liberation) upon Mount Michelsberg above the city of Kelheim, Bavaria, Germany, Europe

The Oriental Pearl Tower illuminated at night in the Lujiazui financial district of Pudong, Shanghai, China, Asia

Union Jack flag flying above the Round Tower, Windsor Castle, Windsor, Berkshire, England, United Kingdom, Europe

Christian ruins from 10th to 12th centuries, round tower of monastic gatehouse, Glendalough, Wicklow Mountains, County Wicklow, Leinster, Republic of Ireland (Eire), Europe

The round Norman Keep (Round Tower) in Windsor Castle with the Queen's flag (Royal Standard) flying, Windsor, Berkshire, England, United Kingdom, Europe

The former church of St. Jost and the Castle Round tower in Cesky Krumlov, UNESCO World Heritage Site, South Bohemia, Czech Republic, Europe

Domes of the Alexander Nevsky Cathedral, Russian Orthodox church, Toompea Hill, Tallinn, Estonia, Baltic States, Europe

Domes of the Alexander Nevsky Cathedral, Russian Orthodox church, Toompea Hill, Tallinn, Estonia, Baltic States, Europe

Monastic gateway, round tower dating from 10th to 12th centuries, Glendalough, Wicklow Mountains, County Wicklow, Leinster, Eire (Republic of Ireland), Europe

The Pikk Hermann Tower, part of the Toompea Castle, UNESCO World Heritage Site, Tallinn, Estonia, Baltic States, Europe

The Pikk Hermann Tower, part of the Toompea Castle, UNESCO World Heritage Site,Tallinn, Estonia, Baltic States, Europe

Fat Margaret Tower, old city walls of the Old Town of Tallinn, UNESCO World Heritage Site, Estonia, Baltic States, Europe

View of Oriental Pearl TV Tower and highrises in the Pudong New Area viewed across the Huangpu River from the Bund, Shanghai, China, Asia

Xumi Fushou (Temple of Sumeru Happiness and Longevity) dating from 1780, Chengde city, UNESCO World Heritage Site, Hebei Province, China, Asia

The River Tiber with Castel Sant' Angelo, Ponte Sant' Angelo bridge and the dome of St. Peter's Basilica, Rome, Lazio, Italy, Europe

Angel statues on Ponte Sant' Angelo bridge with Castel Sant' Angelo at dusk, Rome, Lazio, Italy, Europe

Panorama of Piazza dei Miracoli containing the Leaning Tower of Pisa, the Cathedral (Duomo) and Baptistery, UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe

Sforza Castle medieval tower, 15th century Castello Sforzesco fortified round tower, Milan, Lombardy, Italy, Europe

Ruins of Kilmacduagh Monastery with round tower, County Galway, Connacht, Republic of Ireland, Europe

Leaning Tower (Torre Pendente), Piazza del Duomo (Cathedral Square), Square of Miracles, UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe

Old tower (toston), a defence against English pirates at this northwest coast village, El Cotillo, Fuerteventura, Canary Islands, Spain, Europe

Celtic style cross in graveyard, Kilmacdaugh churches and Round Tower, near Gort, County Galway, Connacht, Republic of Ireland (Eire), Europe

Leaning Tower (Torre Pendente), Piazza del Duomo (Cathedral Square), Campo dei Miracoli, UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe

St. Peter's Church, built in the 12th century, one of only three churches in Sussex with a round tower, Southease, near Lewes, East Sussex, England, United Kingdom, Europe

Round Tower, Krumlov Castle, Cesky Krumlov, UNESCO World Heritage Site, South Bohemia, Czech Republic, Europe

Piazza Santa Croce and Basilica di Santa Croce, Florence, UNESCO World Heritage Site, Tuscany, Italy, Europe

St. Peter's Church, built in the 12th century, one of only three churches in Sussex with a round tower, Southease, near Lewes, East Sussex, England, United Kingdom, Europe

Kilmacdaugh Round Tower and Celtic style cross, near Gort, County Galway, Connacht, Republic of Ireland, Europe

Kilmacdaugh churches and round tower, near Gort, County Galway, Connacht, Republic of Ireland, Europe

Campo dei Miracoli with Santa Maria Assunta Cathedral and Leaning Tower, UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe