Adam Mickiewicz - Mount Kikineis

Look, the abyss, the downward sky, the sea!
Bird-mountain, shot with thunder, furls below
feathers and wings, in curve beyond rainbow,
snow-sails and mast, immobile, vast, free;
and cloudlike over spacious limbo, covers
wide azure - oh, island-hemisphere in flight,
darkens a half-world with its own sad night.
Look, on its forehead ribbon flames and hovers!
Lightning! But stop here. At our feet, abysses,
ravines, thresholds we must at gallop span.
I leap; stand ready with whip and spur; stare
past rock escarpment where I vanish. This is
your sign: If white panache gleams, I am there;
if not, there is no path beyond for man.

Adam Mickiewicz

http://www.poemhunter.com/poem/mount-kikineis/