Cave of Swallows
The largest cave shaft in the world is home to thousands of bird species and is popular with BASE jumpers ( BASE stands for Building, Antenna, Bridge, and Earth).
Called Sótano de las Golondrinas in Spanish and the Cave of Swallows in English, it is the largest known cave shaft in the world and the second deepest in Mexico. The cave is named for the green macaws and white-collared parrots that live along its walls. Every day, the birds fly in concentric circles up the shaft of the cave before flocks spill out of the hole into the jungle.
The cave has recently become home to a number of newer aerial species, namely vertical caves, and stand-hopping animals. A popular destination with extreme sports enthusiasts, it is high enough for BASE jumpers to jump off the edge and free-fall seconds before deploying their skydiving.
Location: Huehuetlán