Four Solaire d'Odeillo
The giant parabolic mirror of Odeillo is one of the most jaw-dropping pieces of science infrastructure on the planet — 63 heliostat mirrors focus sunlight onto a single point that reaches 3,500 °C, hotter than the surface of the sun. Standing in front of this gleaming silver wall against a backdrop of snow-capped Pyrenees is genuinely surreal.
What you'll see
The main reflector stands eight storeys tall and is made up of 9,500 individual curved mirrors arranged on the south-facing slope of the Cerdagne plateau. Guided tours take you inside the research building where scientists melt ceramics, test space materials and study hydrogen production.
From the viewing terrace you can watch the heliostats — spread across the hillside like a field of silver sunflowers — rotate in near-silence to track the sun. On a clear winter day the concentrated beam is visible as a blinding white point of light.
Planning your visit
The Four Solaire is operated by CNRS (France's national research agency) and opens to the public for guided tours, typically running from April through October. Book ahead in July and August as groups fill up fast.
The site sits just below the village of Odeillo, a five-minute drive or a pleasant 30-minute walk downhill from Font-Romeu centre. Wear sunglasses — the reflected light is intense even on overcast days.
Four Solaire d'Odeillo on video
More of Font-Romeu-Odeillo-Via
Discover where to stay, what to do and the best deals for your trip.
Explore Font-Romeu-Odeillo-Via →
