I had the opportunity to go visit the Great Wall of China. Its construction began over 2500 years ago! It is a series of walls that were built to protect China from invasion and the pieces add up to 6200km! It is made of stone, brick, tramped earth, wood and other materials and is one of the largest building projects ever completed. It was worked on for over 1700 years. (In comparison, Canada is not even 150 years old!) When we went to visit it was -50 deg Celsius with the wind chill. We froze! I couldn’t imagine being one of the builders working every day for my whole life building a big wall that I never would get to see completed.