Cave of Pedra Furada

Cave of Pedra Furada (Gruta da Pedra Furada 1) is a small cave and archaeological site in the municipality of Vila Franca de Xira, roughly 20 km north of Lisbon. For anyone curious about Portugal's prehistory, it is one of the more interesting spots within reach of the capital, though it is a heritage site rather than a developed visitor attraction.

Where is the cave?

The cave lies in the Vila Franca de Xira municipality, close to the lower Tagus, about 20 km north of central Lisbon. Its coordinates are approximately 38.965° N, 8.990° W. The town of Vila Franca de Xira has a rail link to Lisbon, which makes it a convenient base for the trip.

How was the cave formed?

Pedra Furada is a karst feature. It developed in the Upper Jurassic limestone that forms the local massif, through karstification, the slow dissolving of rock by water. It is a modest rock shelter rather than a sprawling network of passages.

What did archaeologists find?

The site matters for its human story. Studies inside the cave show that people used it on and off during at least three periods, from the turn of the 4th to the 3rd millennium BC through to the 2nd millennium BC. The earliest phase was collective burial use, backed by a radiocarbon date taken from one individual's bone. Later activity may have been tied to cave cults.

Anthropologists estimate that at least 34 people were deposited here: 10 adults and 24 non-adults, of both sexes. Finds include arrowheads of a Chalcolithic type and pottery in line with Bell Beaker styles known from elsewhere in Iberia.

The material was gathered in the 1950s by Hipólito Cabaço. It was re-examined and published in 2014 in the journal Estudos Arqueológicos de Oeiras. Most of the objects are now held by the Municipal Museum of Vila Franca de Xira.

What else is nearby?

To see artefacts from the cave, start at the Municipal Museum in Vila Franca de Xira, where most of the finds ended up. The town itself sits on the Tagus and is known for its bull-breeding and lezíria riverside plains, which pair well with an archaeology-themed outing.

When should you go?

The cave is an outdoor site, so pick a dry day. Spring and autumn bring mild temperatures around Lisbon, while summer heat on limestone slopes can be punishing. Wear sturdy shoes, as the ground is uneven.

Frequently asked questions

Is Pedra Furada a large cave? No. It is a small karst cave, notable for its archaeology rather than its size.

How old are the finds? They span from the turn of the 4th and 3rd millennia BC to the 2nd millennium BC, mainly the Chalcolithic and Bronze Age.

Where can I see objects from the cave? Most are kept in the Municipal Museum of Vila Franca de Xira.

How far is it from Lisbon? About 20 km north of the Portuguese capital.