TK - nuclear

The Soviet nuclear testing site in present-day Kazakhstan is just one of many places in the world that remain dangerously radioactive to this day.

 

(One of the world's first nuclear reactors, Chicago Pile-3, being buried at Site A. The lone figure in the pit is carrying what appears to be a geiger counter. This was in 1955. Photo courtesy of Argonne National Labs.)

The 10,000-Year Challenge