Business Insider recently traveled to Pripyat, a city in northern Ukraine that was evacuated and abandoned after the Chernobyl disaster.

Chernobyl tour companies recently told CNN that Ukraine will now allow tourists to visit the reactor's control room, where decisions were made that ultimately contributed to the disaster.

It was Britain's worst nuclear disaster, but it is likely you have never heard of it. Unlike Chernobyl ... for 50 hours before being discovered and took three days to bring under control.

But on April 26, 1986, disaster struck at Chernobyl ... before allowing us into the restricted area. The Russian army initially occupied this area during the early days of the invasion three years ago ...