We can't take much credit for this.
It's a list compiled by Hugh Thomson, the travel writer for a course with Arvon.
We've thrown in a few extras for good measure.
Not exhaustive, but a good place to start 

Peter Fleming, Brazilian Adventure
Robert Byron, The Road to Oxiana
Evelyn Waugh – funny and underrated travel writer Try 90 days
Eric Newby – short walk in the Hindu Kush
Graham Greene – Lawless Roads, the Power and the Glory, Our Man in Havana
Norman Lewis – Naples ’66
Laurie Lee – As I walked out one Midsummer morning
George Orwell – Homage to Catalonia

Modern Literary
Bruce Chatwin – In Patagonia, Songlines
Jonathan Raban – Passage to Juneau, Coasting
William Dalrymple – City of Djinns on Dehli
Sarah Wheeler – All good
WG Sebald – The Rings of Saturn
Ruy Costa – Rio de Janiero: Carnival Under Fire
Jan Morris – Venice
WIlfred Thesiger – Arabian Sands
John Steinbeck – Travels with Charley
Claudio Magris – Danube
Iain Sinclair – London Orbital, Hackney that Rose Red Empire

Natural History
Robert Macfarlane – Wild Places, The Old Ways
Roger Deakin – Wildwood
Peter Matthiessen – The Snow Leopard

Bill Bryson
Tahir Shah – Trail of Feathers
Chris Stewart – Driving over Lemons
Clive James – Postcards from ...

Richard Rayner – Los Angeles without a map
Will Self – Pyschogeography
Geoff Dyer – Yoga for people who can’t be bothered to do it

Kari Herbert – The Explorer’s daughter
Benedict Allen – Mad White Giant
Claude Levi Strauss – Triste Tropqiues
Katie Hickman – A trip to the Light Fantastic

We like...
Granta: American Wild, Japan, Britain, The Best of Young Brazilian Novelists, Pakistan
Wherever Mag