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This detailed perspective diagram tracks the structural engineering and robust stone masonry of the Cloaca Maxima, the famous grand sewer system constructed in ancient Rome to drain the marshy lowlands of the Roman Forum into the Tiber River. The visualization highlights a multi-layered cutaway view of the monumental subterranean canal, emphasizing the thick semi-circular barrel vaulting constructed from precisely wedged stone blocks or voussoirs laid in concentric rings to withstand immense overhead soil pressure. The exterior retaining walls are built from dense rows of tufa or travertine blocks laid in horizontal courses, stepping upward into a series of structural stone platforms and terraced foundations designed to prevent soil shifting. A large round-arched outfall portal or gateway breaks the face of the frontline masonry wall, functioning as a primary discharge mouth for municipal wastewater and stormwater runoff, demonstrating the advanced hydraulic civil engineering and sanitation infrastructure that allowed the ancient Roman capital to develop into a dense urban metropolis.