Every foreigner needs a visa to travel to Russia. In order to get it, you need an invitation (visa supporting letter). After that, you can apply for your visa at a Russian Consulate either by yourself or through a local travel agent.

Registration

Foreign citizens staying longer than 1 day in Moscow need to register their stay. Registration can be done upon arrival in the hostel.

Moscow Kremlin

Founded in 1482, it contains four palaces, four
cathedrals and is surrounded by imposing walls.