Tony Robinson and the team visit Newmarket, the birthplace of horseracing, in search of the earliest archaeological traces of the sport. They dig in the heart of the historic town, in search of the remains of Charles II's racing stables, arguably the world's first. With a thick layer of concrete lying over the site, it's not an easy task. Plus, there's a second area to explore: Charles II's 17th-century Newmarket palace.