Ruins of cathedral -renamed the Fethiye Camii (Victory Mosque)- begun by King Smbat II in 987 and finished under King Gagik I in 1010, Ani. Kars province, Anatolia, Turkey

Bermuda. Overseas Territory of the United Kingdom - St. George's Island - St. George. UNESCO World Heritage List, 2000. Unfinished Cathedral. Begun 1874

Oban, harbour, fishing port, 18th century, McCaig's Folly, begun in 1897 and never finished, in the style of Colosseum de Rome, Argyll & Bute, Scotland, UK

Medieval old town of Cefalù with its Norman cathedral begun in AD 1131 by the Norman king Roger II seen from the Rocca, fishing port in background. Cefalù. Sicily, Italy

Cologne Cathedral (most famous Gothic structure in Germany), also called the Kolner Dom, begun in 1248. Cologne (Koln) one of the oldest cities in Germany.

Close_up of carved figures, Hoysaleshvara temple, Halebid, begun in 1121 AD,and uncompleted in 80 years, near Hassan, Karnataka State, India, Asia

The Cathedral St-Etienne, begun at the end of the 11th Century. Cahors is a historic city on an isthmus in a loop of the Lot river. Lot department. Midi-Pyrénées region. France

Oban, harbour, fishing port, 18th century, McCaig's Folly, begun in 1897 and never finished, in the style of Colosseum de Rome, Argyll & Bute, Scotland, UK

The Cathedral St-Etienne, begun at the end of the 11th Century. Cahors is a historic city on an isthmus in a loop of the Lot river. Lot department. Midi-Pyrénées region. France

Oban, harbour, fishing port, 18th century, McCaig's Folly, begun in 1897 and never finished, in the style of Colosseum de Rome, Argyll & Bute, Scotland, UK

Bermuda. Overseas Territory of the United Kingdom - St. George's Island - St. George. UNESCO World Heritage List, 2000. Unfinished Cathedral. Begun 1874

Basilica of The Saints Vicente, Sabina and Cristeta (12th-14th cent. begun in Romanesque style and completed in the early Gothic period). Ávila. Spain

Medieval old town of Cefalù with its Norman cathedral begun in AD 1131 by the Norman king Roger II seen from the Rocca. Cefalù. Sicily, Italy

A distinctive feature of Florence's skyline is the dome of the cathedral ( Duomo ), Santa Maria del Fiore, the building itself, located due north of the Piazza della Signoria, was begun by the sculptor Arnolfo di Cambio in 1296

Oban, harbour, fishing port, 18th century, McCaig's Folly, begun in 1897 and never finished, in the style of Colosseum de Rome, Argyll & Bute, Scotland, UK

Basilica of The Saints Vicente, Sabina and Cristeta (12th-14th cent. begun in Romanesque style and completed in the early Gothic period). Ávila. Spain

Bermuda. Overseas Territory of the United Kingdom - St. George's Island - St. George. UNESCO World Heritage List, 2000. Unfinished Cathedral. Begun 1874

Bermuda. Overseas Territory of the United Kingdom - St. George's Island - St. George. UNESCO World Heritage List, 2000. Unfinished Cathedral. Begun 1874

Interior of Haddon Hall by John Laslett Pott (1837-1901) British history painter, showing Haddon Hall near Bakewell, Derbyshire in Elizabethan times . Begun in medieval times, since 1567 when Dorothy, wife of John Manners, inherited her father Sir George Vernons estate, it has been home of the Manne

Medieval old town of Cefalù with its Norman cathedral begun in AD 1131 by the Norman king Roger II seen from the Rocca, fishing port in background. Cefalù. Sicily, Italy