Less than 50 km apart in Northeast Italy and Slovenia are two impressively large cave systems. Grotta Gigante near Triste, Italy features a massive main cavern while the Postojna Cave features over 24 km of cave tunnels. Both have been welcoming tourists for over 100 years.
A cenote is a natural pit or sinkhole, resulting from the collapse of limestone bedrock that exposes groundwater, found throughout the Yucatán Peninsula in Mexico. Some are large, open-water pools while others are small cracks in the earth. The cenotes were the water source for the ancient Maya; today they’re a popular tourist attraction for…