The locals get paid a lot of money to climb these caves to retrieve the bird nests (made of swallow spit!) for medicinal purposes (birds nest soup. As you can see it's quite high and dangerous (they hange wooden ladders over the top and climb down).
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Cave of Swallows (Español: Sótano de las Golondrinas) is a tourist attraction, one of the Limestone caves in Zopope, Mexico. It is located: 670 km from Ecatepec de Morelos, 730 km from Mexico City, 750 km from Iztaoalaoa. Read further
