Blue Grotto (Amazing caves: Blue Grotto | MNN - Mother Nature Networkから)
Source: mnn.com
(Eye Drop - Imgurから)
(Green Lake in Austria that is a hiking trail for half the year, and a diving destination for the other. - Imgurから)
天然の鏡
x_11406442 (by Reg Ramai)
Source: Flickr / regramai
(Crystal Clear Waters of Sameranger Lake, Austria - Imgurから)
