Thames Barrier Some say the Thames Barrier should be made the 8th wonder of the world. Whether you agree or not, check it out anyway. These enormous gates which can be raised in case of exceptionally high tide to save central London from floods is a marvel of mammoth construction. For the nitty-gritty on the structure, go to the information center in Woolwich. If you only want to check out London’s most underrated landmark, however, go for a boat cruise instead.
A guidebook to walking the Thames Path, a National Trail covering 180 miles between London's Thames Barrier and the river's source in Gloucestershire, passing through Windsor, Oxford and rural countryside. Provides full information for this easy riverside route that takes around two weeks to complete. Includes a 1:25K OS map booklet.