Pascal Siakam #43 of the Indiana Pacers dunks against Jalen Williams #8 of the Oklahoma City Thunder during the third quarter in Game Six of the 2025 NBA Finals at Gainbridge Fieldhouse on June 19, 2025 in Indianapolis, Indiana. (Photo by Maddie Meyer/Getty Images)

Cave Diver, Anhumas Abyss, Bonito, Brazil: The Anhumas Abyss is an underground cavern with a crystal-clear lake below, more than 260 feet (79 m) deep. A visitor must enter through a narrow opening at the top of the chamber and rappel into the cave. Snorkeling and scuba diving in the lake reveal amazing scenery. Distinctive, conical limestone stalagmites and stalactites occupy the lake and the surrounding area, some reaching 65 feet (20 m) high. (Photo by Marcio Cabral/Nature’s Best Photography Awards 2017)