Cultural Heritage in Danger: How Much Can We Afford to Lose?

When we think about cultural heritage (and here I am referring specifically to built heritage) we tend to picture the buildings and infrastructures that, one way or another, we have managed to preserve, that are still standing and continue to tell the story of a place: cathedrals, castles, monasteries, palaces, churches, chapels, manor houses, factories, bridges, railway stations… Much less visible is the heritage that we are losing while you read these lines.

More than 1,600 heritage assets are include on the Red List of Heritage

The Red List of Heritage, created by Hispania Nostra in 2007, seeks precisely to draw attention to this heritage that is gradually disappearing from view. It includes Spanish heritage assets at risk of disappearance, destruction or substantial alteration of their values. It is neither a comprehensive inventory nor a ranking of which regions protect their heritage better or worse: it relies to a large extent on public participation, and the cases submitted are assessed by a scientific committee.

As of September 2026, it includes around 1,648 endangered heritage assets. A further 269 have managed to move out of danger and onto the Green List. But 32 have gone in the opposite direction: onto the Black List, reserved for heritage assets that have disappeared or whose essential values have been irreversibly altered.

Coffered timber ceiling of the Church of Santa María de Colaña in Castromocho (Palencia), included on the Red List of Heritage due to its urgent need for intervention. A representative example of the deterioration threatening many heritage assets in rural areas.

Why oue cultural heritage disappear?

Y detrás de estas cifras hay una realidad bastante menos misteriosa de lo que podría pensarse: salvo en catástrofes naturales o guerras, el patrimonio no desaparece de repente. Primero se abandona. Después deja de mantenerse. Entra agua, falla una cubierta, aparece vegetación, se debilitan las estructuras y llega un momento en que reparar es terriblemente caro. A ello se suma la pérdida de uso: muchos edificios y construcciones históricas fueron concebidos para unas formas de vida, unas actividades y unas necesidades que hoy han desaparecido o cambiado por completo. Cuando dejan de ser útiles para la sociedad actual, es mucho más fácil que caigan en el abandono. La despoblación, los problemas de propiedad, las intervenciones inadecuadas, la falta de recursos, la presión urbanística o, sencillamente, una protección legal que existe sobre el papel, pero no siempre se traduce en una conservación efectiva, agravan más las cosas. Hispania Nostra identifica precisamente el abandono y la falta de mantenimiento como la causa más frecuente de riesgo.

Behind these figures lies a reality that is far less mysterious than one might think: except in cases of natural disasters or war, heritage does not suddenly disappear. First, it is abandoned. Then maintenance stops. Water gets in, a roof fails, vegetation takes hold, structures weaken, and eventually repairs become terribly expensive. Added to this is the loss of use: many historic buildings and structures were designed for ways of life, activities and needs that have now disappeared or changed completely. Once they cease to be useful to contemporary society, they are far more likely to fall into neglect. Depopulation, ownership problems, inappropriate interventions, lack of resources, urban development pressure or, quite simply, legal protection that exists on paper but does not always translate into effective conservation make matters worse. Hispania Nostra identifies abandonment and lack of maintenance as the most frequent causes of risk.

It is worth saying plainly: a significant proportion of the heritage we lose is not lost because we lack the technical means to conserve it, but because we have acted too late. And how much could we lose?… Well, that is a good question. We need to be very cautious. We do not have data that would allow us to state seriously what percentage of Spain’s entire heritage stock will disappear. But we can make a projection for the heritage that has already been identified as being at risk. We have said that, since the Red List was created, 32 heritage assets have ended up on the Black List. If, purely as a continuity scenario (and not as a prediction) we projected the average rate of irreversible loss observed so far over the next twenty years, we would be looking at around 30-35 additional losses, equivalent to roughly 2% of the assets currently included on the Red List. That may sound like a small figure. It is anything but; in fact, we have likely underestimated the figure, given the relentless depopulation of rural areas. Behind that percentage are churches, vernacular architecture, industrial heritage, archaeological sites and other types of heritage that no future restoration will ever be able to bring back. The Red List itself continues to grow: Castilla y León, for example, currently tops the national figures with 459 heritage assets at risk and, paradoxically, is also one of the Spanish autonomous communities with the largest number of inventoried and legally protected heritage assets. This leads to an interesting reflection: having more recognised heritage does not necessarily mean having less heritage at risk. The good news lies in the 88 heritage assets from our region that are now on the Green List: deterioration can be stopped.

So, the real question is not how much heritage we are going to lose over the next twenty years, but how much we are willing to lose before recognising that preventive conservation will always be smarter (and usually cheaper) than arriving only when there is nothing left to do but mourn the ruin.