Built to carry the Llangollen Canal across the River Dee, which provided a direct waterway link between the industrial towns of Shropshire and the Welsh coalfields, the Pontcysyllte Aqueduct is one of the most remarkable engineering achievements of the Industrial Revolution.
The city of Baghdad was founded by the Abbasid Caliph Al-Mansur.
Elisha Otis was an American mechanic who invented the safety elevator, which featured a mechanism to prevent the platform from falling if the hoisting cable failed.
The 555-foot tall Washington Monument was dedicated at a ceremony featuring President Chester Arthur alongside fellow politicians, engineers and freemasons.
Construction began on the campanile of the Cathedral of Pisa, now better known as the Leaning Tower of Pisa.
On the 27th December 537, Hagia Sophia was inaugurated by Byzantine Emperor Justinian I and Patriarch Menas of Constantinople.
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