the vaulted corridor is
lined with portals to places unknown
and linked to other hallways
in an infinite labyrinth

one can go from "here"
to anywhere,
but there's no map 
yours will be a stochastic journey;
one might prefer to systematically
 duck one's head into portals,
getting a feel about whether 
a given route seems favorable --
but we all know that one must often
travel through unfavorable territory
to get where one wants to be

and so it's like being thirsty in a life raft --
as per Coleridge's Mariner:
"Water, water, everywhere, 
Nor any drop to drink"

in this case,
 it's a free ticket to anywhere,
if you can only find your way,

but what're the odds?