The scenes on the island were filmed on Sa Conca Beach, near Girona in Catalonia. Like most of that coast the Spaniards have let it get hideously over-developed in the last 45 years.
Another view of Sa Conca today.
The Harryhausen creatures in the film consist of a giant crab, giant bees and a giant prehistoric bird. It turns out that all of these are the results of experiments by Captain Nemo to feed the starving of the world. Although a diet of crab, honey and giant chicken is an odd selection of staple foods.
" Maybe it's not such a good place to build a villa!"
The best of these monsters is the giant bird. the encounter with it is up with the roping of the dinosaur in Valley of Gwangi and the fight with the Allosaurus in One Million Years BC.
The crab model was built inside the shell of a real crab whilst two live crabs were used for close-ups, until Harryhausen had them for dinner.