Chernobyl Reactor 4 is enclosed with a sarcophagus. The roof, constructed after the disaster, partially collapsed in February 2013. There exist plans to put the structure into a new safe enclosure. More info here.
Name: Chernobyl Reactor 4 Site
Lat, Long: 51.389553,30.099147
Location: Prypyat, Kyivska oblast, Ukraine