There is normally,  its the watch tower, but you have to expand it, but who knows how it is working at the moment.

Note.

Its only for the town and not the tiles.

Also there are no attacks on your town if you have a shield on.

Hi and for us who using pc, when people spy on the tile there is a special sound, but you cant see who is spying , but you get the sounds.

Not that you are likely to get this suggestion implemented,why would you only want it for those using a pc?

Even outside the town, if you have other dialog window open, you will not see the red lines of the attack comming to you city. This is frustrating in JOT for example.

Thank you for your suggestion, Fulcrum, I have forwarded it further🙂🙏