Travel: Austria's Green Lake in the Hochschwab Mountains is a hiking trail in the winter. The snow melts in early summer and creates a completely clear lake. The lake has a grassy bottom, complete with underwater trails, park benches, and bridges.
There is a giant mushroom in Oregon that is over years old, covers square miles of land, and is still growing - HOWEVER, it is NOT THIS MUSHROOM. The Oregon mushroom looks like many small fungi spread across miles of land.
Walk the jungle tree tops in Costa Rica. Arenal Hanging Bridges, Costa Rica - A three kilometer hike through the Costa Rican rain forest. There are six suspension bridges, with the largest one at just under 100 meters long and 45 meters off the ground.