lost to the rest of us の意味は？

Wilfred Thesiger, who crossed Arabia’s Empty Quarter in 1946, and belongs to an era of unmechanised travel now lost to the rest of us, told me, ‘If I’d gone across by camel when I could have gone by car, it would have been a stunt.’ To him, exploration meant bringing back information from a remote place regardless of any great self-discovery. (Cambridge 15 Test 1 Reading Passage 3)

上記の文章の意味がいまいちよく分かりません。
特に
①lost to the rest of us
②it would have been a stunt.
の意味を教えてください。
よろしくお願いします。