Calling all water babes. Did you know that you can go swimming in what has been dubbed as one of the worlds most beautiful sinkholes? This particular sinkhole in Oman is so stunning it has been turned into a tourist attraction for the world to appreciate. Imagine swimming in a seawater sinkhole in the middle of the desert, dipping your toes in the emerald and tranquil teal waters as little fish nip at your toes (did someone say free fish pedicure?). If a day trip isn't enough, you can also go camping on the side of the swimming hole. This unforgettable experience is a true hidden treasure for adventurers. Set inside the Najm Park, there is free parking and no entry fee. The biggest barrier to you and your backstroke is a concrete stairway of 64 steps leading down to the base of the picturesque Bimmah sinkhole.