Best London Walking Tours, Reviewed

We compared London's most-booked walking tours on route, guide quality and group size. A Westminster/Buckingham Palace tour covers the postcard sights in under three hours and suits a first visit; a City of London or Tower of London-focused tour goes deeper on history and rewards a second trip. Both beat trying to self-guide the same ground with a map — London's core sights are close together but the walking routes between them aren't obvious on foot.