Russia's Mil Mi-26 is one of the world's largest helicopters and an absolute beast, capable of carrying 44,000 pounds, including 90 soldiers or 60 stretchers, anywhere. The 8 rotor blades are powered by two engines to generate the necessary lift.
Often called the world's largest helicopter, it's actually based on a prototype that was larger, the Mil V-12. The V-12 never went into full production, so the Mi-26 is the largest helicopter ever mass produced.
It was originally designed to carry heavy vehicles and ballistic missiles flown into country on large cargo planes. Now, the Mi-26 is used for a variety of military and civilian heavy-lift tasks, including sling loading large helicopters and carrying them to maintenance facilities.
Watch one of these monsters carry a Chinook in the video below: