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Corroded Concrete
Nothing lasts forever, not even concrete:

Downspout Splash Block – Corroded Concrete The downspouts are obviously more recent than the splash blocks, but the whole shopping center wasn’t more than a few decades old. Rain isn’t nearly as acid as it used to be, but it still eats away at concrete.
After about two decades, though, even high-quality concrete goes bad:

Rt 376 bridge deterioration – marker 1102 – 2018-05-07 That’s the upper surface of the Rt 376 bridge at Red Oaks Mill, with a fragment of the corroded lower edge still dangling over the Wappinger Creek:

Red Oaks Mill bridge – dangling concrete Mostly, we manage to bike around the decayed infrastructure.