Why are houses so cheap in Johnstown, PA?

ATLANTIC UNION Bank 12 B1BANK 10 Bank of Dudley 14 BANNER Bank 10 BESSEMER TC 14 Coleman County State Bank 10 FARMERS & MRCH Bank 1 Farmers State Bank of Hamel 4 First Montana Bank 7 First Security State Bank 4 First State Bank of Forrest 4 Henderson State Bank 6 PCB Bank 17 Peoples Bank of Wyaconda 7 Pioneer Community Bank 7 Security Bank Midwest 2 TITAN Bank National Association 17 U S Bank National Association 16 WAFD Bank 9 Waldo State Bank 6