Bird of Paradise flowers (Strelitzia reginae).
If you want more information about this flower, just search the plant's Latin (botanical) name on Google:
Strelitzia reginae is a monocotyledonous flowering plant indigenous to South Africa. The flowers stand above the foliage at the tips of long stalks. The hard, beak-like sheath from which the flower emerges is termed the spathe. This is placed perpendicular to the stem, which gives it the appearance of a bird's head and beak.