visit, call on, pay somewhere a visit / for an occurrence to come, arrive

since some unclear time

sometime; someday

Great Wall of China

long castle or wall / long line of castles / (figuratively) a person who is to become the head of state.

(と〜) thinking that […] (with the next clause explaining that the truth is contrary to expectations)

to seem, to appear

in my opinion; I think; I guess; upon thought; upon reflection; upon contemplation / conceivably; presumably

as one wishes, in a way that one wants

(as と思われ) (2channel slang) Synonym of と思う (to omou)