Mecca Royal Clock Tower vs Florence Duomo

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The Abraj Al-Bait (Arabic: ????? ??????, romanized: ?Abr?? al-Bayt 'Towers of the House') is a government-owned complex of seven skyscraper hotels in Mecca, Saudi Arabia. These towers are a part of the King Abdulaziz Endowment Project which aims to update the city in catering to its pilgrims. The central hotel tower, the Makkah Royal Clock Tower, has the world's largest clock face and is the third-tallest building and fifth-tallest freestanding structure in the world. The clock tower comprises the Clock Tower Museum which occupies the top four floors of the tower.The building complex is metres away from the world's largest mosque and Islam's most sacred site, the Great Mosque of Mecca.

The developer and builder of this complex is that the Saudi Binladin Group, the Kingdom's largest construction firm. It's the world's second most expensive building with the whole cost of construction totalling US$15 billion. The complex was built after the demolition of the Ajyad Fortress, the 18th-century Ottoman citadel on top of a hill overlooking the Grand Mosque. The destruction of the historically important site in 2002 from the Saudi authorities sparked international outcry and a powerful response from Turkey.

Source: Wikipedia

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Florence Cathedral, officially the Cattedrale di Santa Maria del Fiore (Italian pronunciation: [katte?dra?le di ?santa ma?ri?a del ?fjo?re]; in English'Cathedral of Saint Mary of the Flower'), is the cathedral of Florence, Italy (Italian: Duomo di Firenze). It was started in 1296 in the Gothic style to a style of Arnolfo di Cambio and was structurally completed by 1436, with the dome engineered by Filippo Brunelleschi. The outside of the basilica is confronted with polychrome marble panels in various shades of pink and green, bordered by white, and contains an elaborate 19th-century Gothic Revival façade by Emilio De Fabris. The cathedral complex, in Piazza del Duomo, comprises the Baptistery and Giotto's Campanile. These three buildings are part of the UNESCO World Heritage Website covering the historic centre of Florence and are a significant tourist attraction of Tuscany. The basilica is one of Italy's largest churches, and before the development of new structural materials in the modern era, the dome was the biggest in the world. It remains the biggest brick dome ever constructed. The cathedral is the mother church of the Roman Catholic Archdiocese of Florence, whose archbishop is Giuseppe Betori.

Source: Wikipedia