Norilsk (Russian: Нори́льск nah-REEL'SK) is a large city in Taymyria. Because of its strategic importance, Norilsk is a closed city and special permission is needed for travel (which will likely be denied unless you have a really good reason). Norilsk is the second largest city above the Arctic Circle, Murmansk is the first.
The only reasonable way of reaching Norilsk is by plane as there are no all-weather roads connecting the city with the rest of Russia. Alykel Airport (IATA: NSK) is 35km west of town. Direct flights are available from Krasnoyarsk, Moscow, Saint Petersburg, and Yekaterinburg amongst others.
Opportunities to arrive in Norilsk by other means than a plane are few. There are buses from the nearby port-city of Dudinka and from Talnakh. However, the passenger train linking all three cities is gone, nowadays the world's northernmost railway only serves freight trains.
Norilsk does not have many sights to attract tourist, but one building interesting to visit is the wooden cottage built by explorers in 1921. It's the first house in what was to become Norilsk, and nowadays is a museum of the geological expedition.
Visit the worlds northenmost theatre, the Norilsk Polar Drama Theatre 
If you do get permission to go to Norilsk, be aware that it is considered one of the 10 most-polluted cities on Earth, and that a substantial stay could jeopardize your health.