Nature at it's finest, where time stood still

It's hard to pick one shot so I picked a feeling. We were in Yucatán province in Mexico and went on a tour to see the cenotes (which were made by the meteor that killed the dinosaurs 65 million years ago, how cool is that?!) so it's basically a network of little tunnels and caves now many of which are filled with the most crystal clear water you've ever seen. I hadn't been having a great time mentally that year and all I remember is swimming and feeling so immensely at peace; just nature at it's finest where time stood still - it's something I'll never forget and still brings me calm and joy just writing this.