Opal Creek Wilderness in the Willamette National Forest in Oregon -- Opal Creek Valley contains 50 waterfalls, five lakes, and 36 miles of hiking trails with year old trees. Went on a trip to opal creek in grade. Best week of out door school ever!
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.