In a large bowl, whisk together the flour and salt. In a separate bowl, stir together the yeast and warm water until dissolved. Add the olive oil and yeast mixture to the dry ingredients and mix until combined. Knead the dough on a lightly floured surface for about 10 minutes, or until it is smooth and elastic.
Transfer the dough to an oiled bowl, cover with plastic wrap or a damp towel, and let rise in a warm place for 1-2 hours.
Oil a 9x13 inch baking pan with olive oil. Turn out the dough onto the pan and press it into an even layer. Cover with plastic wrap or a damp towel and let rise again for 45 minutes.
Preheat oven to 425 degrees F. Drizzle dough with more olive oil then sprinkle rosemary leaves over top. Bake for 25-30 minutes until golden brown.