WATCH: Florida fisherman catches 552-pound grouper on kayak. 1  Florida fisherman Jon Black caught a 552-pound grouper while fishing in Sanibel Fla. on May 20. 2  He believes this is a record catch for someone on a kayak.
The Greek historian Herodotus claimed that Babylon surpasses in wonder any city in the known world and specifically praised the walls which he said were 56 miles (90 kilometres) long, 80 feet (24 metres) thick, and 320 feet (97 metres) high.
On top of the stone retaining wall, stood another wall made of mud-bricks, 6 feet (2m) thick, and 20 to 26 feet (6-8m) high. Together these two walls combined to form a fortification 32 to 41 feet high. To put this into perspective, envision a 4 story tall building. Such was the height of the walls of Jericho.