Even the biggest cities have a feature that tends to became a focus point as the city grew and developed. For London that’s the River Thames.
It’s still maybe the most important thoroughfare for the city. Most of what’s important is close to the Thames. It takes about an hour to walk from stroll from the Houses of Parliament along the South Bank to the Tower of London. While walking along the Thames may not have the romanticism of a stroll along the Seine in Paris, it’s every bit as interesting.