When the Chernobyl reactor disaster occurred in 1986 a 30 klm area was set up as the Zone of Alienation and everyone that lived in that area was evacuated leaving everything behind, this included the 50000 residents of the town of Pripyat around 5 klm from the reactor and the 14000 residents of the town of Chernobyl around 14 Klm from the Reactor. Today these towns are modern day ghost towns that are slowly falling into ruin and they give us a good glimpse of what 1980s Soviet Russia was like.
Day trips from Kiev in the Ukraine (about 130 klm’s away) can be organized to visit the area, it’s claimed to be fairly safe for short visits and the guide is armed with a Geiger counter so you know where not to stand. If the idea of copping a bit of radiation turns you off visiting the area check out these videos instead, they are mostly of Pripyat, the town closest to the reactor. The town of Chernobyl has got a few plant workers and scientist living in it and what is left is looked after, unlike Pripyat.