"Modern-Day Fight at Alamo is Against Mold and Deterioration"

Over 170 years ago, the Mexican army attacked the Alamo. Today, the assault is coming from mold.

From WOAI-TV:

Left untreated, the mold creeps down from the top of the building, first darkening and then eating away at the creamy colored stone, said Alamo historian and curator Bruce Winders.

"What it does is dissolve the rock," Winders said. "It doesn't do it immediately, but it's one of those really gradual processes."

That's one of the hazards of a very humid climate, deterioration of historic structures. Good thing a shot of fungicide helps.