Since the first nuclear test explosion on July 16, 1945, at least eight nations have detonated 2,056 nuclear tests. This includes areas from Lop Nor in China, atolls of the Pacific, Nevada, Algeria (where France conducted its first nuclear device), western Australia (where the U.K. detonated nuclear weapons), the South Atlantic, Kazakhstan, across Russia, as well as others. Most of the test sites are on the lands of indigenous peoples, far from the capitals of the testing governments.
A large number of the early tests—528—were detonated in the atmosphere, which spread radioactive materials through the atmosphere. Many underground nuclear blasts have also vented radioactive material into the atmosphere and left radioactive contamination in the soil.
This time elapsed map by Japanese artist Isao Hashimoto in 2010 shows the unfathomable amount of testing that has been done across the world in the name of the nuclear arms race. The video shows 2,053 tests to that point in date.
The U.S has tested the most with 1,030 tests with the most recent Sept 1992. USSR/Russia is second with 715 with the most recent being Oct 1990. France is third with 210 tests with the last being Jan 1996. The U.K has tested 45 times as well as China with 45. The last being for the U.K was on Nov 1991. China’s was on July 1996. North Korea has tested 6 according to The Nuclear Testing Tally with the last being in Sept 2017. India has tested 3 different times with the last one being in May 1998. Pakistan has 2 tests with the last one recorded in May 1998.
On October 30, 1961, the USSR detonated the largest nuclear weapon ever tested and created the biggest man-made explosion in history. The blast, 3,000 times as strong as the bomb used on Hiroshima, broke windows 560 miles away. The flash of light from the blast was visible some 620 miles away. The Tsar Bomba as it become known as, yielded 50 to 58 megaton TNT, twice the size of the second largest detonation.