This is a good classic Sci-Fi book. I would highly recommend this. Definitely old school pulp.
A classic of the finding a lost civilization genre. I found this novel very interesting. Unfortunately I haven't seen the old movies that were made from this book. It wasn't terrific but it did held my attention.
I found this book mildly interesting but the science in it is absurd. I know they didn't know much but I've seen better books during the period in when it was written. It was written by a person who was involved with the opera.
A very good story in the Burroughs vein of stories. Good science fiction for its time.