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Ancient Megastructures: St Paul's Cathedral
Built in the aftermath of the Great Fire of London, Christopher Wren's cathedral took 36 years to be completed and remains an iconic landmark.
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Ancient Megastructures: Alhambra
Arguably the most perfect example of Moorish architecture in existence, the Alhambra's construction process lasted over 150 years.
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Ancient Megastructures: Petra
Located in modern-day Jordan, the magnificent Khazneh was an astonishing feat of engineering. Find out about the great king behind its creation.
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Ancient Megastructures: Machu Picchu
Built to celebrate Emperor Pachacuti, creator of the Inca Empire, Machu Picchu is regarded as one of the planet's most awe-inspiring monuments.
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Ancient Megastructures: Angkor Wat
Situated deep in the Cambodian jungle, the majestic temple of Angkor Wat – designed to honour the Hindu god Vishnu – took over 30 years to build.
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Ancient Megastructures: Istanbul's Hagia Sophia
Discover how the church of Hagia Sophia in Istanbul, rebuilt by the Roman Emperor Justinian, has survived 1,500 years of turbulent history.
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Ancient Megastructures: Taj Mahal
A fascinating look at the 16th-century tragic love story that inspired the construction of the spectacular Taj Mahal mausoleum in India.