The Crusader castle dominates the Byblos archaeological site, built in the 12th century from the recycled stones of the ancient city around it. Its towers provide an elevated view over the entire archaeological area — a perspective that makes the spatial logic of the ancient city legible in a way that ground-level exploration doesn't achieve. The castle is partially intact, with accessible ramparts and interior spaces that give a sense of its original scale.
The castle was built by the Genoese Embriaco family, who controlled Byblos as a Crusader lordship for generations. After the Crusader period it passed through Mamluk, Ottoman, and finally French colonial hands before becoming a public historical site. The combination of Crusader stonework incorporating visibly ancient material makes the castle an archaeological document in itself, and understanding what you're looking at adds considerably to the visit.