In Islam, every allowed action is an act of worship, if it is done in the spirit of worship, in the name of Allah (God.)
http://www.islam101.com/dawah/05_concept_worship.html
http://www.islamreligion.com/articles/222/
Muslims worship in mosques. Jewish people worship in synagogues.
Muslims worship at a mosque it's Jews who worship at a synagogue
Muslims worship in a Masjid. Also called a mosque. == ==
Muslims do not worship any country. however, the question may be asking about in what countries do Muslims worship. The answer is Muslims worship in almost all countries of the world, either as majority or as minority.
Muslims can worship in any country, there are no rules about this.
Muslims worship house
Shi'ite Muslims worship in Mosques as do Sunni Muslims.
Muslims go to Mosques and Christians go to churches.
Muslims neither worship pork or beef. The only thing the worship is God. It is the opposite, muslims consider pigs filthy animals.
Muslims believe there is only one god, ALLAH. Muslims worship ALLAH.
Islam is the religion, Muslims are the ones who follow the religion. They do not "worship" Islam, as Christians don't worship Christianity.
Muslims do not worship any book, rather they worship their God, Allah. They do however, believe in the scripture, Qur'an, which is a massive deviation from worship.