Netflix offers this summary of the film Journey to the Center of the Earth (emphasis mine):

Science professor Trevor (Brendan Fraser) has become the laughingstock of the academic community thanks to his outrageous theories. While on a trip to Iceland, Trevor, his nephew Sean (Josh Hutcherson) and their guide Hannah (Anita Briem) find themselves at the center of the planet, having discovered a whole world within our world. Adapted from the Jules Verne fantasy novel, this film (presented in 2D) marks the directorial debut of Eric Brevig.

Everybody knows the Earth is flat.  Why would you need more than two dimensions to tell a story about it?

Besides, I never settle for anything less than 4D when I watch movies at home.