El Rec Comtal & Subterranean Network

Constructed in the 10th century under Count Mir atop an ancient 1st-century Roman aqueduct, supplying 13 kilometers of freshwater to medieval flour mills and guilds.

Preserves open canal excavations at El Born and Sant Andreu, connected to Pere Garcia Fària's 19th-century gravity-fed subterranean sewer network.

Archaeological sluice gates preserved at El Born demonstrate how medieval water masters regulated water pressure to royal mills.