For the subways that are there, can we make them disused? and make them in to tunnels that we can walk through with hidden extras and mini side quests?
it would be super cool if they were really dilapidated and creepy. haunted maybe, or where deimaginators have small fires in oil barrels.
For fine examples the London underground has a wealth of hidden tunnels and disused items: underground-history.co.uk/f...