Basalt and igneous rocks show a wonderful landscape in Iceland, In Northern Ireland or in some parts of America. Here you can see some pictures where the geometrical shapes that basalt produce with other natural landscapes as huge as glaciers but in this case with very hot lava.
NORTHERN IRELAND, THE GIANTS CAUSEWAY
ICELAND HEXAGONAL ROCKS, BEACHES AND RIVERS OF LAVA.
But you can see this in the Devils Tower in Wyoming USA.
Follow the kink for more information.
Visit this website with some explanations about this hexagonal formations.
And check this website to see the formations in the Giants Causeway too.