MOSQUE
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If you mean praying (or Salah) by worship, then it is almasjid (or the mosque). However, Muslims are allowed to pray in any clean dry place on earth as open land areas, office, home, halls, or even in ships or airplanes.
Yes, Muslims go to the Mosq on Fridays
Muslims go to Mosques and Christians go to churches.
Muslims don't worship any building. Even, the Kaaba (that is the most sacred Islamic building) is not worshiped by Muslims but respected and honored by Muslims. If you wish to read about places where Muslims worship (both houses of worship and sacred sites) read the Related Question below.
There are three places of worship where Muslims should go: Makkah, Madina and Masjid Al Aqsa in Jerusulum
The Western Wall in Jerusalem.
Muslims worship five times every day. A special prayer is offered on every Friday.
Friday is their day of worship.
Muslims usually wash parts of their body before worship because it is a sign of cleanliness and consecration before God. It shows that they want to approach God with a clean heart.
I presume you mean Muslims. The place of worship for Muslims is called a Masjid, also called a Mosque in some places.
no one knows for sure?
Masjid-ul-Haram (the Ka'aba) in Makka Mukarrama, Masjid-un-Nabi in Madina Munawwara, and Masjid-i-Aqsa in Jerusalem are the most sacred places of worship for the Muslims.
some Muslims worship at home because they do not live close enough to a Mosque so they have somewhere to pray at home instead. on special occasions they may try their best to worship at a Mosque though.