Apart from the LK Lander, it was also hugely impressive to see an actual Lunokhod. For those who are not familiar, Lunokhods were the first robot probes to explore another world, the Moon.
They were also intended to provide support for the Soviet manned lunar program. A lunokhod would survey the landing area to ensure it was safe, and also act as a beacon top guide the manned lander to the correct location.
A spare lander would be in the immediate area, and there were plans for a Lunokhod version with a footplate, so it could transport the cosmonaut there in the event of an emergency.