So it has its own cellular infrastructure, recording pings from nearby phones as they automatically seek to maintain connectivity. The result is videos like this one, uploaded by Bellingcat. Its a large stone building, constructed well before things like wireless phone signals were something to consider. One of the leaders of the group, named Stringer Bell, comes over. (Heres a YouTube playlist of some.)
all the visitors to the stone building are ed walking.
( z0 walk :ARG0 ( z1 person :ARG0-of ( z2 visit :ARG1 ( z3 building :cxnsistof ( z4 stone ) ) ) :mod ( z5 all ) ) )
(z0 / walk-01
    :ARG0 (z1 / person
              :ARG0-of (z2 / visit-01
                           :ARG1 (z3 / building
                                     :consist-of (z4 / stone)))
              :mod (z5 / all)))
all the visitors to the stone building are ed walking .
z1 :mod z5
z1 :ARG0-of z2
z3 :consist-of z4
z2 :ARG1 z3
z0 :ARG0 z1