Highrise and Clock Tower, Shanghai, China

Duomo, Siena, Italy

View of cathedral through a round opening in the city wall, Luebeck, Schleswig-Holstein, Germany, Eu

Sacre Coeur at Montmartre, Paris, France

Rock of Cashel, County Tipperary, Ireland; Round tower through doorway

Toy teeter-totter on top of stacked boxes

Variation of colorful objects displayed in a row against white background

Section of beach near Torre San Giovanno near Posada, Sardinia, Italy

Round stone church bell tower and church, Basilica San Apollinare Nuova, Ravenna, Emilia-Romagna, It

Round Tower, Ardmore, County Waterford, Ireland

View of a lighthouse by sea and buildings with mountains against sky

Buildings of the former Yenidze cigarette factory, Dresden, Saxony, Germany, Europe

Passau Lower Bavaria Germany at the bank of the river Inn

Round Tower, Celtic Cross, Devenish Island, Fermanagh, Co Fermanagh, Ireland

Variation of objects displayed against white background

Marienberg Fortress W

Torre San Giovanno, old watchtower near Posada, Sardinia, Italy

Round Tower, Devenish Island, Lower Lough Erne, Co Fermanagh, Ireland

Green round minaret decorated with Arabic script islamic place of pilgrimage Moulay-Idriss Morocco

Five storey temple with round roofs Hanuman Dhoka Old Royal Palace Panch Mukhi Hanuman Temple Kathma

Meelick Round Tower, Swinford, Co Mayo, Ireland

World clock, Alexanderplatz Square in Berlin, Germany

Reactor dome, Nuclear power plant Goesgen, Switzerland

Kilmacduagh, near Gort, County Galway

Traffic sign: roundabout, yield

Ukraine Kiev golden domes of St. Michel Monastey 37 wiedererbaut 1996

Round Tower, Monasterboice, Co Louth, Ireland

Westerndorf town of Rosenheim Upper Bavaria Germany pilgrimage church Holy Cross

Denmark, Copenhagen, Our Saviour Church

Round Tower, Co Cork near Blarney, Ireland

Ukraine Kiev golden domes of St. Michel Monastery37 wiedererbaut 1996

Westerndorf town of Rosenheim Upper Bavaria Germany pilgrimage church Holy Cross

Monastic site, Glendalough, Co Wicklow, Ireland

Ukraine Kiev golden domes of St.Michel Monastery Uk37 wiedererbaut 1996

Bad Abbach Lower Bavaria Germany castle hill donjon of the former castle where emporer Heinrich II w

Ulster History Park, Omagh, Co Tyrone, Ireland

Monastic settlement, Glendalough, Co Wicklow, Ireland

Round tower, Ardmore, Co Waterford, Ireland

Kilmacduagh Round Tower, Gort, Co Galway, Ireland

Kilmacduagh near Gort, County Galway

Donaghmore round tower, Navan, Co Meath, Ireland

Clonmacnoise, Co Offaly, Ireland

County Antrim Irish round tower silhouette, Northern Ireland

Donaghmore Round Tower, Navan, Co Meath, Ireland

Kinneigh Round Tower, Dunmanway, Co Cork, Ireland

Round Tower, Ardmore, Co Waterford, 12th Century, Ireland

Co Tipperary, Rock Of Cashel, Ireland

Round Tower at Turlough, Co Mayo, Ireland