列宁墓
An important monument of the Soviet-era is the Lenin's Mausoleum, which is located in the western side of the square. It stands by the Kremlin wall at the height of the Senate Tower, almost exactly where the protective moat ran until the 18th century, and a tram line ran from 1909–1930. Inside the mausoleum, the lavishly embalmed corpse of Vladimir Lenin rests in an armored glass sarcophagus. To this day, the mausoleum is open to visitors on certain days.