For the final part of his journey, Tony hits his home turf, the East End of London.
Tony Robinson follows the river as it winds its way through the Thames valley, stopping off at Henley-on-Thames, and then on towards the palace at Hampton Court, a distance of around 160km.
The UN predicts that the human population could reach 10 billion people by the year 2050. Broadcaster and naturalist Chris Packham investigates why our population is growing so rapidly, what impact it's having on the natural world, and whether there is anything that can be done.
Joanna kicks off her adventure in Havana. She takes a tour around the city, visits the small town of Hershey, Che Guevara's tomb, Fidel Castro's hometown, which is preparing for the 60th anniversary of the Great Revolution.