One of the famous landmarks in UK is the stonehenge. It is said to be a burial ground constructed from 3,000 BC to 2,000 BC. Livescience said that the biggest of Stonehenge's stones, known as sarsens, are up to 30 feet tall and weigh 25 tons. Many archeologists are still wondering how the people from this era made a structure like this without using the help of machines such as putting stones above the other because it really takes a lot of muscles and machines to build this one.