Chernobyl, 27 Years Later

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On this day 27 years ago, an explosion at the Chernobyl Nuclear Power Plant near the city of Pripyat, Ukraine, killed dozens of people and released a plume of radioactive fallout that would eventually require the relocation of more than 350,000 people.

The event ranks as the worst nuclear disaster in history. The area immediately surrounding Chernobyl is still too radioactive for habitation and will remain so for another 20,000 years. Until recently, an exclusion zone of 19 miles (30 km) extended in all directions from the power plant, which is now entombed in concrete. In 2011, however, Ukraine opened up this area to tourists, giving the world a peek into a town abandoned and untouched for nearly three decades.