Visitors to an art exhibition
Some people will travel a long way to visit an exhibition, but all the way from another dimension? They walls are simply covered with pictures of life in grimy, grim Salford, for goodness sake, what are the chances they might include the portal to another plane of existence?
I mean, why should such inter-dimensional beings bother to visit such a backwater? What does it have to offer them? What can they offer it?