Solar panels disguised as ancient Roman tiles or terracotta bricks to match the city skyline. The innovative solutions adopted by the archaeological park of Pompeii and the Portuguese city of Evora pave the way for an inspiring model: turning architectural constraints into assets, boosting heritage and sustainability.

Each year over 3.5 million tourists from all over the world visit Pompeii to admire the ruins left by the eruption of the Vesuvius that, in 79 AD, engulfed it together with the nearby city of Herculaneum. Some of them might have bumped into the sheep which have been recently introduced to mow the grass in the archaeological park. But certainly none of them will have seen the solar panels on the magnificent House of Cerere.