It says in the civilopedia that a great artist can instantly convert an enemy city. I have a great artist, but I cannot enter an enemy city while at peace or after declaring war. I then moved him to my city closest to the enemy city I wished to capture. I went to activate super power, but it only gives me the option to settle, not convert an enemy city. I am not trying to convert a capital. Does anyone know how to flip a city with a great artist?