A museum in Johnstown, Pennsylvania dedicated to the devastating flood in 1889 that wiped out the town, was recently forced to close... and you've already guessed why.
The Johnstown Flood Museum is temporarily closed due to flooding. A valve broke on a pipe on the museum's third floor and sprung a leak that flooded the building, causing extensive damage, but not destroying any of the exhibits. There's no timetable yet for when the museum will reopen.
The Johnstown Flood in 1889 occurred when a dam was breached by heavy rainfall and sent a swell of water into the valley and destroyed the town. More than 2,000 people died. (The Guardian)