The essay begins with a multisensorial immersion in the figural orchestration of a marble column from the north portal of the cathedral of Santiago de Compostela (known as the Porta Francigena, ca. 1105), which features episodes of the struggle of Ulysses with the sirens and other sea monsters, inspired by Roman sarcophagi and interpreted through the lens of Christian allegory. Taking nostos (journey of return of heroes in ancient epic) as a critical concept for the study of Nachleben der Antike (Afterlife of Antiquity), the article proceeds by developing a series of in-depth analyses of other sculptures that originally formed part of this façade, but are now reused and decontextualized in other parts of the cathedral, including such famous pieces as the "Woman with the skull". The analysis delves in their classical sources, traces their iconographic and formal transformations, and explores their phenomenological effects as they were perceived by pilgrims arriving in the square set before this portal. Literary references to authors such as Virgil, Lucretius, or Ausonius, alongside theoretical engagements with the work of thinkers such as Aby Warburg and his Mnemosyne project, or Michel Serres and his liquid history, serve to elucidate the iconographic program, chronographic structure, and material poetics of the Porta Francigena, which here emerges as a key work in the corpus of medieval art.