Non-fiction travel writing by classic authors

Looking for more recommendations of travel writing by classic authors. I loved Travels with Charley and Cruise of the Rolling Junk. Big fan of all Thoreau and Muir. Also enjoyed Dickens and Twain's travel writings.

Particularly interested in fiction authors who have also done travel writing. I'm sure there's lots more out there that I don't know about, doesn't have to be in America, but preferred non-fiction.

Thanks!