Russia is home to one of the world's oldest and deepest lakes, Lake Baikal, which holds around 20% of the Earth's unfrozen freshwater.
Russia has a floating nuclear power plant named Akademik Lomonosov, designed to supply electricity to remote areas, making it the world's first mobile nuclear power station.
Within the Vatican City, there is a post office that has an unusual privilege - it is the only post office in the world that does not bear any country's name on its postage stamps.