A 7,000-year-old willy-shaped rock has been listed as a monument of public interest.
The large phallic megalith was discovered by hunters in the late 1990s.
The rude rock had fallen over during the Chalcolithic era, which follows the Neolithic period and precedes the Bronze Age.
Known as the Menhir of Patalou, it dates back to the 5th millennium BCE.
The megalith, which was carved out of granite and has phallic features, was re-erected in 2015.
Standing at four metres (13.1ft) in height, the stone structure is located in Nisa, northeast of Lisbon, Portugal.
It is believed that the stone was associated with Neolithic fertility cults.
The local council has announced that the megalith is now listed as a monument of public interest.
Secretary of State for Culture, Isabel Cordeiro, said the Menhir of Patalou is “carved in granite with a phallic appearance and presenting faint traces of decoration engraved with serpentine motifs.”
The authorities said the monument was re-erected six metres north of its original position.
The willy-shaped rock weighs seven tons and is considered “one of the largest menhirs” of an explicitly phallic typology in the Iberian Peninsula.