Lisa Jardine describes how Britain's desire to build an empire promoted botany.
Media executive and broadcaster Greg Dyke chooses explorer Captain James Cook.
Neil MacGregor with a feathered helmet given to Captain Cook by Pacific Islanders.
Jerry Brotton looks at Sir Walter Raleigh's quest for gold
The history of British explorers and routes to China in the 1570s.
Sir Stuart Rose discusses the life of the cartographer who mapped Australia.
Raleigh tries to persuade Elizabeth I that the North American settlements were a success.
Melvyn Bragg and guests discuss the voyages of James Cook, as suggested by listeners.