The theory also assumes, without any proof, that the day of Creation was the same length as it is now.If we go by what the Bible says, then the time from creation to today is approximately 6 thousand years.
The original London Bridge was taken apart and rebuilt in Lake  Havasu, Arizona as a tourist attraction. The current London Bridge  is in Central London.
It's natural to plan a visit to the UK that starts in London. Most visitors do simply because it's the United Kingdom's most famous entry point and, in Heathrow, it has the world's busiest international airport.