El Machnaqa site houses a well preserved Roman altar, one of the few left in Lebanon.
The altar is believed to have been constructed during the 2nd century AD over an earlier structure that dates back to the Phoenician era.
Surrounded by a big court yard (Temenos), the altar is claimed to be linked to the myth of Adonis since it stands on a hill that overlooks the Adonis River (Nahr Ibrahim currently).
On the northern side of the site, 3 rock-tomb with funerary bas-reliefs are still standing and well preserved.
The stones of the site have been unfortunately pillaged with time.