San Nicolo Cathedral, Noto, UNESCO, Noto Valley, Sicily, Italy

Capela dos Ossos, Third Order of Our Lady of Mount Carmel Church (Ordem Terceira de Nossa Senhora do Monte do Carmo), Faro, Algarve, Portugal

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

The Hubs, lottery-funded project originally National Centre for Popular Music, now Hallam University Students Union, Sheffield, Yorkshire, England

Ponte dei 21 Archi (Bridge of 21 Arches), Spinazzola, Barletta-Andria-Trani, Apulia, Italy

The ancient Greek city of Mycenae, UNESCO, an archaeological site near Mykines in Argolis, north-eastern Peloponnese, Greece

Ferreres Aqueduct, UNESCO, Tarragona, Catalonia, Spain

Court of the Lions, Nasrid Palaces, Islamic and Mudejar architecture, Alhambra, UNESCO, Granada, Andalusia, Spain

Puerta del Vino, Islamic and Mudejar architecture, Alhambra, UNESCO, Granada, Andalusia, Spain

Air Force Palace, Bari waterfront, Bari, Apulia, Italy

Cathedral of Santiago de Compostela (Cathedral of Saint James of Compostela), UNESCO, Santiago de Compostela, Galicia, Spain

Wardour Castle, a 14th Century castle at Wardour, near Tisbury, Wiltshire, England, United Kingdom

Palazzo Ducale, Old Town, UNESCO World Heritage Site, Urbino, Marche, Italy, Europe

National Basilica of the Sacred Heart, Koekelberg, Brussels, Brabant, Belgium, Europe

View of Oslo Opera House and Munch Museum at dusk, Oslo, Norway, Scandinavia, Europe

Avenue of Sphinxes, Temple complex of Karnak, UNESCO World Heritage Site, Thebes, Egypt, North Africa, Africa

Colossal statues of King Ramses II, Abu Simbel, UNESCO World Heritage Site, Egypt, North Africa, Africa

Iglesia de San Pedro, Avila, UNESCO, Castilla y Leon, Spain

The Colosseum (Colosseo), UNESCO, Rome, Lazio, Italy

Aerial of tombs carved in sandstone rock of Jabal Banat (Qasr al-Bint), Hegra (Madain Salih), UNESCO, AlUla area, Medina Province, Saudi Arabia

Interior of St. Aubin's Cathedral, Late Baroque style, Namur, Wallonia, Belgium

Iconic Big Ben and Houses of Parliament, UNESCO, Westminster, London, England, United Kingdom

Guangji Gate Tower, built in 1370, the gate leads into Chaozhou ancient city, Paifang street, Chaozhou City. Guangdong Province, China

Guangji Bridge, built in 1170, one of China's four famous ancient bridges, Chaozhou City, Guangdong province, China

The Interior of Metropolitan Cathedral of Saint Paul, Mdina, Malta

Wat Rong Khun, the famous White Temple, Chiang Rai, Thailand

Dubai Downtown skyscrapers as viewed from the Dubai water canal, Dubai, United Arab Emirates

Dubai skyline at sunset with Burj Khalifa, the world tallest building and Sheikh Zayed road traffic, Dubai, United Arab Emirates

View of modern skyscrapers in Dubai, the fastest growing city in the world, Dubai, United Arab Emirates

The entrance to the Palace Hotel in Dubai with Burj Khalifa in the background, Dubai, United Arab Emirates

Dubai skyline at dusk with Burj Khalifa, the world tallest building and Sheikh Zayed road traffic, Dubai, United Arab Emirates

Dubai skyline at dusk with Burj Khalifa, the world tallest building and Sheikh Zayed road traffic, Dubai, United Arab Emirates

Hawa Mahal (Palace of the Winds), Jaipur, Rajasthan, India

Ranakpur Jain temple (Chaturmukha Dharana Vihara), Ranakpur, Rajasthan, India

Humayun's Tomb Complex, UNESCO, Delhi, India

View of Harpa Concert Hall and Conference Centre in the city centre in winter, Reykjavik, Iceland

View of Hallgrimskirkja church illuminated at dusk in winter, Reykjavik, Iceland

Overview with the Hassan II Mosque in the background at dusk, Casablanca, Morocco

Overview with the Hassan II Mosque in the background, Casablanca, Morocco

Hassan II Mosque seen from the seaside, Casablanca, Morocco

Royal tombs of Petra, UNESCO World Heritage Site, Jordan, Middle East

Temple of Ramesses III, Medinat Habu, UNESCO World Heritage Site, Thebes, Luxor, Egypt, North Africa, Africa

Grand Place, UNESCO World Heritage Site, Brussels, Belgium, Europe

Pompidou Centre at night, Beaubourg, Paris, France

Maraya Theatre, architect Studio Gio Forma, mirrored structure seeming to disappear in AlUla's Ashar Valley, AlUla, Medina Province, Saudi Arabia

Monster Buildings at sunrise, Quarry Bay. Hong Kong, China

Former dome of the Vestibule of Diocletian's Palace, UNESCO World Heritage Site, Split, Croatia, Europe

Sculpture at the Temple Expiatori del Sagrat Cor and Torre de les Aigues de Dos Rius, Mount Tibidabo, Barcelona, Catalonia, Spain, Europe

Colonnaded footpath under the roadway viaduct, Park Guell, UNESCO World Heritage Site, Barcelona, Catalonia, Spain, Europe

Caerphilly Castle and Moat, Caerphilly, Gwent, Wales, United Kingdom, Europe

Cardiff Crown Court, Cardiff, Wales, United Kingdom, Europe

Skyline view of St. Paul's Cathedral from Tate Modern, London, England, United Kingdom, Europe

Colossi of Memnon, massive stone statues of Pharaoh Amenhotep III in the Theban Necropolis, UNESCO World Heritage Site, Luxor, Egypt, North Africa, Africa

Matthildenhoehe, UNESCO World Heritage Site, Darmstadt, Hesse, Germany, Europe

Stone Buddha statue, Borobudur, 9th-century Mahayana Buddhist temple, UNESCO, Java, Indonesia

The Colosseum (Colosseo), UNESCO, Rome, Lazio, Italy

View of Kyoto Station at night, Shimogyo Ward, Higashishiokojicho, Kyoto, Honshu, Japan

Torii shaped entrance to Kanazawa station, designed by architects Sejima and Nishizawa, Kanazawa City, Ishikawa Prefecture, Honshu, Japan

Thuraya Wellness lounge, Our Habitas AlUla, sustainable luxury resort in ancient oasis in canyons of Ashar Valley, Medina Province, Saudi Arabia

Maraya Theatre, architect Studio Gio Forma, mirrored structure seeming to disappear in AlUla's Ashar Valley, AlUla, Medina Province, Saudi Arabia

Maraya Theatre, architect Studio Gio Forma, mirrored structure seeming to disappear in AlUla's Ashar Valley, AlUla, Medina Province, Saudi Arabia

Maraya Theatre, architect Studio Gio Forma, mirrored structure seeming to disappear in AlUla's Ashar Valley, AlUla, Medina Province, Saudi Arabia

Maraya Theatre, architect Studio Gio Forma, mirrored structure seeming to disappear in AlUla's Ashar Valley, AlUla, Medina Province, Saudi Arabia

Ancient Propylaea building entrance, The Acropolis, UNESCO, Athens, Greece

Aerial view of the Maraya Theatre, architect Studio Gio Forma, mirrored structure in AlUla's Ashar Valley, AlUla, Medina Province, Saudi Arabia

Guangji Bridge at night, built in 1170, one of China's four famous ancient bridges, Chaozhou, Guangdong province, China

Amer Fort (Amber Fort), Rajasthan, India

City Palace, Jaipur, Rajasthan, India

Hawa Mahal (Palace of the Winds), Jaipur, Rajasthan, India

City Palace, Udaipur, Rajasthan, India

Humayun's Tomb Complex, UNESCO, Delhi, India

Qutb Minar complex, UNESCO, Delhi, India

Lotus Temple, a Bahai House of Worship in New Delhi, India

Noble Staircase, Bolsa Palace, UNESCO World Heritage Site, Porto, Norte, Portugal, Europe

View of Tokyo Tower from its base against cloudy sky, Shibakoen, Minato City, Tokyo, Honshu, Japan

The oculus in dome of the Pantheon, former Roman temple, now Basilica of St. Mary and the Martyrs, UNESCO, Rome, Lazio, Italy

Meteora, ancient holy Monastery of Varlaam, UNESCO, Kalabaka, Greece

Wanfo (Ten Thousand Buddha) Pagoda, reconstructed 2014, at night, Jinhua City, Zhejiang Province, China

Ranakpur Jain temple (Chaturmukha Dharana Vihara), Ranakpur, Rajasthan, India

Tower of London, UNESCO World Heritage Site, elevated view, London, England, United Kingdom, Europe

View towards Canary Wharf, London, England, United Kingdom, Europe

St. Stephen's Cathedral (Stefansdom), Vienna, Austria

View of city bus and contemporary architecture in the Barcode area on a sunny day, Oslo, Norway, Scandinavia, Europe

Architectural detail of the ceiling of Saint Peter's Basilica in Vatican City, the papal enclave in Rome, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

Nasrid Palaces, Islamic and Mudejar architecture, Alhambra, UNESCO, Granada, Andalusia, Spain

Abu Dhabi Grand Mosque, Iconic Landmark and Architectural Marvel of UAE