One of the greatest stories of world exploration ever told.
By the late eighteenth century, the river Niger was a 2,000-year-old two-part geographical problem. Solving it would advance European knowledge of Africa, provide a route to commercial opportunity and help eradicate the evil of slavery.
Mungo Park achieved lasting fame in 1796 by solving the first part of the Niger problem - which way did the river run? Park died in 1806, in...