The number one tourist attraction in the UK is Stonehenge. Stonehenge is a prehistoric monument that is located in Wiltshire, England. The monument consists of a circle of large stones that are arranged in a specific pattern. Stonehenge is believed to have been built by the ancient Britons over 4,000 years ago. Today, Stonehenge is one of the most popular tourist destinations in the UK, with over 1 million visitors each year.