The Antonov An-124 Ruslan once held the title of the largest aircraft ever mass produced.
Although trumped by its cousin, the An-225 Mriya, and more recently the Airbus A380, it's still an impressive sight both inside and out.
During development it was known as the An-400 or An-40. It flew for the first time in 1982.
It has a payload capacity of 150,000 kg (330,000 lb).
Here's a short video of the An-124 on static display at the Dubai air show 2007: