Rainbow Falls_Watkins Glen State Park, New York This place is usually filled with people. The best time to take photos without anybody in the pictures is at 7 am before sunrise waterfalls_pool_stone_bridge
Emerald Pool, The Alps, Austria it's not in Austria, it's just over the border in Slovenia: The Mostnica pool & waterfall in Triglav National Park near Bled. Wonderful area, try to include it in your trip to Austria.
Victoria Falls, Southern Africa on the Zambezi River at the border of Zambia and Zimbabwe. Victoria Falls – indigenously called Mosi-oa-Tunya, or "Smoke that Thunders” – plunges a misty into narrow Batoka Gorge.