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View across the tranquil waters of Calura Bay, sunrise, ancient watchtower visible on headland, Cefalu, Palermo, Sicily, Italy, Mediterranean, Europe

Autumn colours and a watch tower on The Great Wall of China, UNESCO World Heritage Site, Badaling, China, Asia

Autumn colours and a watch tower on The Great Wall of China, UNESCO World Heritage Site, Badaling, China, Asia

View of the Duomo with Brunelleschi Dome and Basilica di Santa Croce from Piazzale Michelangelo, Florence, UNESCO World Heritage Site, Tuscany, Italy, Europe

Ancient church at sunrise, San Romerio Alp, Brusio, Canton of Graubunden, Poschiavo Valley, Switzerland, Europe

The Mausoleum of Hadrian (Castel Sant'Angelo) (Saint Angelo's Castle), Parco Adriano, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

The ancient medieval tower of Rocca Corneta on the top of a hill in autumn, Emilia Romagna, Italy, Europe

Historical buildings and obelisk of the ancient Piazza Federico II, Jesi, Province of Ancona, Marche, Italy, Europe

Ancient Koutoubia Mosque, UNESCO World Heritage Site, and Jemaa el Fna road at twilight, Marrakech, Morocco, North Africa, Africa

Autumn colours and a watch tower on The Great Wall of China, UNESCO World Heritage Site, Badaling, China, Asia

View of the ancient Castelo dos Mouros with its stone tower, Sintra municipality, Lisbon district, Portugal, Europe

The knights stronghold of Sigulda in the Gauja National Park, Sigulda, Latvia, Baltic States, Europe

Sunrise on ancient Torre Del Belvedere tower and snowy woods, Maloja, Bregaglia, Engadine, Graubunden Canton, Switzerland, Europe

Autumn colours and a watch tower on The Great Wall of China, UNESCO World Heritage Site, Badaling, China, Asia

Brunelleschi's Dome on the Duomo frames the old medieval city of Florence, UNESCO World Heritage Site, Tuscany, Italy, Europe

Autumn colours and a watch tower on The Great Wall of China, UNESCO World Heritage Site, Badaling, China, Asia

Night view of the ancient and holy Basilica of the Holy House framed by arcades, Loreto, Province of Ancona, Marche, Italy, Europe

A bell tower at the Franciscan monastery of St. Eupehmia on the island of Rab, Kvarner region, Croatia, Europe

View of ancient city walls and the historical center, Alghero, Sardinia, Italy, Mediterranean, Europe

The Brunelleschi's Dome frames the old medieval city of Florence, UNESCO World Heritage Site, Tuscany, Italy, Europe

View of the Duomo with Brunelleschi Dome and Palazzo Vecchio from Piazzale Michelangelo, Florence, UNESCO World Heritage Site, Tuscany, Italy, Europe

Trajan's Markets, Torre delle Milizie Turm, Trajan's Forum (Foro di Trajano), UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

Clifford's Tower, the former Keep of York Castle, named after Roger de Clifford who was hanged there in 1322, York, Yorkshire, England, United Kingdom, Europe

Castel Sant'Angelo Castle with Ponte Sant'Angelo Bridge, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

Ancient church perched on mountains, San Romerio Alp, Brusio, Canton of Graubunden, Poschiavo Valley, Switzerland, Europe

Autumn colours and a watch tower on The Great Wall of China, UNESCO World Heritage Site, Badaling, China, Asia

View over marina towards ancient castle, Castelsardo, Sassari Province, Sardinia, Italy, Mediterranean, Europe

View of the old town of Florence with the Duomo di Firenze and Brunelleschi's Dome in the foreground, Florence, UNESCO World Heritage Site, Tuscany, Italy, Europe

Historical buildings and obelisk of the ancient Piazza Federico II, Jesi, Province of Ancona, Marche, Italy, Europe

The colourful clock tower (torre del reloj) along the ancient city walls in Cartagena de Indias, Colombia, South America

View of ancient city walls and the historical center, Alghero, Sardinia, Italy, Mediterranean, Europe

Aerial view of Sam Gimignano from one of its medieval stone towers, UNESCO World Heritage Site, Tuscany, Italy, Europe

Ancient castle of Vignola (Rocca di Vignola) framed by trees, Vignola, Emilia Romagna, Italy, Europe

Aerial view of Sam Gimignano from one of its medieval stone towers, UNESCO World Heritage Site, Tuscany, Italy, Europe

View over marina towards ancient castle, Castelsardo, Sassari Province, Sardinia, Italy, Mediterranean, Europe

View over the Palmyrene Tower Tombs, multi-storey burial chambers dating from the 1st and 2nd centuries AD, at the ancient Graeco-Roman city of Palmyra, UNESCO World Heritage Site, Syria, Middle East

The towers of La Chaine and St. Nicholas at the entrance to the ancient port of La Rochelle, Charente-Maritime, France, Europe

Il Duomo di Firenze, Cathedral of Florence, and campanile bell tower in Piazza di San Giovanni, Tuscany, Italy

Qutub Minar minaret tower with verses from the Qur'an at Qutab Minar Complex, Unesco World Heritage Site in New Delhi, India

Qutub Minar minaret tower with verses from the Qur'an at Qutab Minar Complex, Unesco World Heritage Site in New Delhi, India

Qutub Minar minaret tower with verses from the Qur'an at Qutab Minar Complex, Unesco World Heritage Site in New Delhi, India

Il Duomo di Firenze, Cathedral of Florence, and campanile bell tower in Piazza di San Giovanni, Tuscany, Italy

Nails and lion-head knocker on gate to Tower of Buddhist Incense at The Summer Palace, Beijing, China

Nanmyin watchtower (the leaning tower of Ava), 27m high, damaged by 1838 earthquake, all that remains of the palace built by King Bagyidaw, ancient city of Inwa (Ava), Mandalay, Myanmar (Burma), Asia

Place de la Republique, Arles, Bouches du Rhone, Provence, Provence-Alpes-Cote d'Azur, France, Europe

Qutub Minar minaret tower with verses from the Qur'an at Qutab Minar Complex, Unesco World Heritage Site in New Delhi, India

Hotel tourist accommodation in former castle, Pousada Castelo de Altivo, Alvito, Baixo Alentejo, Portugal, Europe

Place de la Republique, Arles, Bouches du Rhone, Provence, Provence-Alpes-Cote d'Azur, France, Europe

Qutub Minar minaret tower with verses from the Qur'an at Qutab Minar Complex, Unesco World Heritage Site in New Delhi, India

The 21m octagonal tower of the Thien Mu Pagoda by the Perfume River near Hue, Vietnam, Indochina, Southeast Asia, Asia

Nails and lion-head knockers on gate to Tower of Buddhist Incense at The Summer Palace, Beijing, China

Nails and lion-head knocker on gate to Tower of Buddhist Incense at The Summer Palace, Beijing, China

The Punic mausoleum, dating from 2nd century BC, Roman city of Sabratha, UNESCO World Heritage Site, Libya, North Africa, Africa