Fingal's Cave is a sea cave on the uninhabited island of Staffa, in the Inner Hebrides of Scotland, known for its natural acoustics. The National Trust for Scotland owns the cave as part of a National Nature Reserve.
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.
Emerald pool at Subway, Zion National Park, Utah. This isn't part of Emerald Pools. It is called "The Subway" Bring your asses out here you two and lets all go for an adventure! This is like an hour from my place here!