Two N1 launch vehicles on adjacent launchpads.

The N-1 was a heavy lift rocket intended to deliver payloads beyond low Earth orbit, acting as the Soviet counterpart to the NASA Saturn V rocket.^[2] This heavy lift booster had the capability of lifting very heavy loads into orbit, designed with manned extra-orbital travel in mind. Development work started on the N-1 in 1959.^[2] Its first stage is the most powerful rocket stage ever built.^[3]

• http://en.wikipedia.org/wiki/N1 (rocket)