It's one thing for a historic landmark to contain, say, a time capsule, like the one found in a statue at Boston's Old State House. But what happens when a monument is filled with bird poop?
That's what happened to a medieval monument in England. The 14th-century Landgate Arch in Rye, East Sussex, was filled with 25 tons of pigeon poop, Discovery News reports. The cleanup took four days and required a custom-built pressure tanker to suck the waste out of the arch's towers.