As you climb from Cadaqués toward Cap de Creus and look at the hillside, there's one thing that takes a moment to sink in: those horizontal lines running across the whole mountain aren't geology. They're walls. Thousands of walls built stone by stone, without a drop of cement, to turn an impossible slope into flat fields for planting vines and olive trees. The technique is called pedra seca (dry stone), UNESCO recognises it as intangible cultural heritage of humanity, and what you're looking at is probably the greatest collective effort this village's people ever made.
What pedra seca is
Pedra seca is the oldest, simplest, and most effective form of traditional architecture in history: building by stacking stones that hold each other up through their own weight and fit, with no mortar of any kind. On the steep seaside slopes of Cap de Creus, hundreds of structures of this type stand.
It's not just walls. The repertoire includes stone terracing to create flat ground for farming the slopes; walls and low walls to mark out plots and paths; and shelters, huts, and windbreaks to make life easier for whoever worked there. It's an entire landscape built by hand.
The feixes: making flat what isn't
The terraces are called feixes. Thanks to the feixes laid out by farmers around Cadaqués, hundreds of hectares of vineyard could be farmed for years on a mountain where, without them, not even the soil holds in place.
In the 18th century, the whole of Cap de Creus was one immense field of vines and olives, and its products were traded inland through the Figueres market or exported through the coastal harbours. During the second half of the 19th century and the first of the 20th, olive and vine growing reached their peak. The village that lives off the sea and visitors today lived off that mountain for a very long time.
How it ended
Two blows. The vines disappeared with phylloxera, the plague that wiped out European vineyards in the late 19th century. Farmers then turned to olives, and the olives fell to the frosts of 1956, which ruined the sector.
That explains what you see today: kilometres of perfect terracing holding up terraces where nothing farmed grows any more. The walls are still there because they were well built — they've gone over a century with nobody maintaining them and they're still standing — but what they supported is gone. It's a beautiful landscape and, at the same time, the ruin of an entire economy.
How to look at it as you walk
Any route out of Cadaqués toward the Muntanya Negra, the lighthouse, or Portlligat passes dozens of these walls. It's worth stopping at one and looking closely: how each stone is chosen to fit against its neighbours, how the visible face is flat and the hidden one acts as a wedge, how water drains through the joints so the wall doesn't burst.
And then looking at the whole hillside and doing the maths. For anyone spending a few days here, that shift in perspective is what separates a pretty landscape from one you actually understand. The grey of the Cap de Creus schist wasn't put there by geology alone: people placed it, by hand, over generations.