The Wieliczka Salt Mine is a beautiful place in southern Poland. It used to produce table salt for over 800 years till 2007 being one of the oldest companies in the world. This mine is referred to as ‘the undeground salt cathedral of Poland’ that attracts 1.2 million tourists from all over the world annually who come to see historic statues and mythical figures carved out of the rock salt.
I read a rumour online that stated you could see through Darth Vader's mask eye-lenses at the end of the movie, during the Death Star trench scene, and see David Prowse's eyes(Darth Vader's 'body' actor in Eps I -> III). I had some free time today and slow-mo'ed through my Special Edition DVD with these parts with Darth Vader and confirmed this (see pic 1). More interestingly, and I think I'm the first to see this, it seems like digital artists have composited Hayden Christian's "yellow" eye onto a shot (see pic 2). This is weird because you can see both David Prowse's eye AND Hayden Christian's "yellowed" eye super-imposed above it. It happens at 01:50:32 on my UK, Region 2 DVD. I used VLC to alter "Adjust and effects" to find these. For my monitor, hue is set to lowest, Contrast is set full, brightness is set to ~80%, saturation 50% and gamma 10%.