To really understand Rome, you must understand its people - or the mob, as they were known in ancient times. As Giorgio Locatelli and Andrew Graham-Dixon explore Italy's iconic capital, they are in search of the generations of ordinary Romans who have left their mark on the city's culture and gastronomy.
The historian reaches the southernmost stretches of the Egyptian Nile, though her 900-mile journey is not quite over as she joins archaeologists as they extract a giant stone message board from the foundations of the temple of the crocodile god Sobek. Bettany also visits a hotel once frequented by Churchill and says farewell to her boat crew. After reaching Egypt's border with Sudan where Rameses the Great built an outrageous temple to himself, the presenter joins the crowds to witness the power of the rising sun.
Bettany visits the west bank of the Nile opposite Luxor where, for 500 years, the Ancient Egyptians buried their pharaohs in the Valley of the Kings, among them the boy-king Tutankhamun. However, the historian crosses the local hills to the Workers' Village, where generations of skilled royal tomb-builders lived. As it turns out, they also dumped masses of domestic rubbish, which is now giving some insight into the highs, lows and preoccupations of ancient Egyptians. Bettany then heads south on the Nile's oldest steam ship SS Sudan, which inspired Agatha Christie to write Death on the Nile.
Joanna ends her 5,000 mile journey in the place where she was born, Srinagar in Kashmir. She starts off in the Ranthambhore National Park, where she hopes to spot a tiger in the wild. Meeting tiger conservationist Belinda Wright, Joanna witnesses the work of local NGO Tiger Watch, who are attempting to break a cycle of poaching and poverty through education. Home to over 18 million people, Delhi is a city of stark contrasts. The extreme differences are obvious when Joanna visits a homeless community - where 10,000 men live under a flyover - and visits the modern part of the city where she has a go at working in a hi-tech call centre. The final leg of her journey takes her north from Delhi to Dharamsala, where she is granted a private audience with His Holiness the Dalai Lama. Joanna concludes her trip with a stay on a houseboat in Srinagar, as her parents did on honeymoon in 1941.
Setting out amongst the active, snow-capped volcanoes of Kamchatka, over 4,000 miles from Moscow, Simon explores one of the remotest regions of the country. The population of Russia's far east has fallen dramatically in recent years, but travelling by chopper and skidoo, Simon finds indigenous reindeer herders who are still eking out a fragile existence. In the port city of Vladivostok, Simon visits a newly built mega casino, designed to attract high rollers and tourists from neighbouring China. Deep in the forest, Simon meets the inspirational conservationist who has created a sanctuary for the country's most iconic predator, the giant Amur tiger. Simon ends his journey on the rim of a giant crater that has emerged in the Siberian landscape - chilling evidence of the impact of global climate change.