Idolatry is when you worship something and think it is God or give it the attributes of God. Sometimes muslims can show much exuberance over a place, and although some who call themselves muslim may actually take a place as an idol of some sort, that is not indicative of what muslims really fell about a place. Like I would love to go to Mecca and visit the grave of the Prophet, but I do not worship the Prophet nor Mecca nor the Ka'ba. I do not pray to these things. When we pray in a certain direction we are not praying to the direction, nor the Mecca nor to kabah, we are praying to Allah, and only this is a sign of unity to muslims to assist in bringing our hearts together and foster a sense of togetherness.
Often the shi'ites do take shrines of different places and people and things. Like many of them make prayers to Hussain (ra). This is shirk/polytheism/idol worship, and those engaged in it have ceased to be muslim because a muslim is the most guarded against any shirk. To take a shrine of a place and worship the inhabitants of a grave in that place and all those sort of things are forms of shirk. So if you go looking at what alot of shiites do, you're likely to find that sort of thing. However Islam speaks the most vehemently against all forms of shirk great or small.