Werner's back, and this time in three dimensions! Much parodied because of his distinctive voiceover style, Werner Herzog movies are always interesting to read about, and I intake the film as just a starting point of interest. Having read a lot about Cave of Dreams before and after watching it, I enjoyed the experience of learning about another Herzog fascination.
The movie itself literally put me to sleep at times -- fuel up with strong coffee if long shots of images set to music knock you out -- but it's a unique project and worthy of a viewing. As Slate says, it's "a ponderous and nauseating theme-park ride, but one that unfolds as a probing essay on the history of art." That pretty much captures it. I wouldn't recommend Cave of Forgotten Dreams for everyone but if you're a Werner fan, it's a must see.