Do you know that a lot of old Moscow metro stations look like true underground palaces? They are decorated with works of art, marble, mosaics, and sculptures. Some of them have entered into the history of world architecture. No two stations are alike. The best time to go there for a tour when it's cold or rainy outside. The rush hours are to be avoided, it is always overcrowded between 07:30-10:00 and 17:00-19:30. All the Metro entrances outside are indicated by a red letter M. The fee for one trip is fixed and does not depend on changing the lines. Today it is 26 rubles (less than $1) or cheaper, if to pay for a certain number of trips. Inside there will be Metro map in each vestibule and each train but the information written in English is not provided on platforms and you may get problems with Russian letters. If you missed your direction don't follow the crowd, ask people and one of the passers-by (may be not the first one) will help you. What I recommend you to do if you are gonna visit it by yourself? You can go around the circular line, the most convenient for not to get lost. Where you start there you finish your trip. The whole journey will take less than one hour. The most gorgeous stations on this line are Novoslobodskaya and Kievskaya. The style of those stations of the 50s can be called the official optimism.
The little blurb used on the metro sounds as: “Careful, the doors are closing (Ostorozhno, dveri zakriyvayutsya). The next station is… (Sleduyuschaya stantsiya…)”.