The World’s Greatest Feats of Engineering
 
 
The Palm islands
which are three artificial islands located in the Dubai coastal area, ranked first on the list. The materials used for the islands are sufficient to build a wall that could circle the world three times. 
 
The Aqueduct of Segovia
 is an artificial waterway that dates back to the Roman era. It is considered one of the most important ancient monuments of the city and one of its national symbols, as evidenced by its presence on the city’s coat of arms. 
 
Great Wall of China
s a series of fortifications that stretches across China’s northern borders from Shanhaiguan, on the Bohai Sea in the East, to the Ganso Province in the west. Another wall was built to the south, stretching from Beijing to Handan.
 
Taj Mahal
 is a magnificent mausoleum made entirely of white marble. It is situated in Agra, Uttar Pradesh, India and was built by Mughal emperor Shah Jahan as a memorial to his third wife, Mumtaz Mahal. The building, which was made from white marble, appears pink in the morning, white in the day and golden in the moonlight. Construction of the Taj Mahal took around 20 years
 
Trans-Siberian Railroad
is a 9,289-kilometer railroad that connects Moscow and Eastern Russia with Japan, China and Mongolia.  It is the longest railroad around the world and it can operate in temperatures of minus 20 degrees Celsius.

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