r/BeAmazed • u/RemoteBonus7795 • Apr 28 '24

Place Cologne Cathedral, Germany

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u/[deleted] Apr 28 '24

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u/Reddit_sucks_3000 Apr 28 '24

Acid rain causes "melted" look, not grime, basically just faster erosion.

And that still doesn't take into account that the churches were also often maintained much like any building, the speed of weathering changed a lot though in the last 2 centuries.

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u/MikeRowePeenis Apr 28 '24

Was gonna say, pretty sure that’s algae and other microorganisms