Lenin's Mausoleum in Red Square is more than a tomb: it is the beating heart of an epic that defined the 20th century. Here, in the solidity of red granite, lies the embalmed body of the man who hijacked history and made revolution an eternal idea. But what happens when time runs out and the ideology that made him an icon disintegrates? Lenin is not just a leader, he is an enigma that transcends time, surviving the collapse of the USSR and re-emerging as a symbol in today's Putin's Russia. From his rise to lead the Bolshevik uprising to the illness that marked his decline, this book reconstructs the mystery of the body that cannot be buried, the memory that cannot be erased. Following Lenin through his secret rooms, his travels and his documents, inaccessible for a century, the story reveals the background to his embalming, entrusted to a reluctant scientist, and the meaning of a political experiment that challenged the very nature of history. With a clear eye and compelling prose, the author offers a reflection on Russia yesterday and today, on its continuities and ruptures, and on a body that continues to haunt the present.