One day, I will go to Ireland: "Tree tunnel Northern Ireland: The Dark Hedges is a beech alley planted in County Antrim in the eighteenth century. The ancient gnarly trees form a natural arched tunnel which is now one of the most famous local landmarks."
Australia'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. So cool!