Why do deserts sometimes preserve ancient footprints and ruins so well?

Arid climates can be surprisingly good at preserving delicate evidence because water, which usually drives decay, is scarce. Little rainfall means less chemical weathering, fewer plant roots, and less microbial activity to break down materials. In some desert sites, footprints, textiles, and buildings can remain visible for centuries or even longer if they are protected from wind and occasional flooding. This is why archaeologists often find exceptional preservation in desert environments.