The Grand Canal of China is the World’s longest canal or artifical river with a length of 1,776 km (1,104 mi). Its history goes back as far as 500BC, when a Chinese ruler decided to start building canals to connect natural waterways.
North America has had a rich history long before any Europeans “discovered” it. One of the many interesting civilizations is the Mississippian culture, which is known for their mound architecture as exemplified by the Kincaid Mounds State Historic Site. It is located in southern Illinois across the Ohio River from Paducah, Kentucky.
The Mehrangarh Fort in Jodphur, India is one of the biggest still standing castles worldwide. It’s foundation was laid in 1459 by a man named Rao Jodha. Other rulers kept improving and enlarge the castle for hundreds of years.
The Roman Emperor Hadrian (76-138) had a problem. His province Britannica (modern day Britain) was under constant threats from the Northern part. Barbarians would sometimes try to invade the North Roman borders or -if just interested in getting rich- make money with smuggling goods.