Are you currently on the far right of the map and not touching any sides? if so thats why. You need to be on the very side of the map on whichever side you intend to travel, corners I believe you can go to 2 sides... or was it 3.. Anyhow if you want to enter the city make sure you are on that bottom row.
"It is in the time when darkness falls evil reigns and all hope has faded from site, that true leaders emerge bearing the gift of hope in its purest form."