What was the welcome sign of more hospitable climate which Conway discovers? (Chapter Three)

From the text..... the welcome sight was lamasery at Shangri-La.

To Conway, seeing it first, it might have been a vision fluttering out of that solitary rhythm in which lack of oxygen had encompassed all his faculties. It was, indeed, a strange and half-incredible sight. A group of colored pavilions clung to the mountainside with none of the grim deliberation of a Rhineland castle, but rather with the chance delicacy of flower petals impaled upon a crag. It was superb and exquisite.