The Yucatan Peninsula is home to the longest underwater cave system in the world. Sistema Sac Actun was found to be connected to Sistema Nohoch Nah Chich, creating a system 154,783 meters long, the longest underwater cave in the world. By comparison the previous record holder Ox Bel Ha measured a puny 146,761 m. I mean that’s only 91 miles long, sheesh. The two have been exchanging the record for years as new, previously unexplored, sections are discovered. The whole system has been named Sistema Sac Actun, and is home to some of the most decorated and beautiful cave diving sites in the world. The most well known entrance is Grande Cenote, pictures of it are above and below. There is surprisingly little information about this incredible cave system, but we’ve shared what we could find. Once you get in to the system the water temperature is relatively constant, and some parts are very fragile and require perfect buoyancy. As you get deeper in the system there are incredible stalactites and stalagmites, and other geologic features.
Top 9 The Seagaia Ocean Dome
The Seagaia Ocean Dome was the world’s largest indoor waterpark, located in Miyazaki, Miyazaki, Japan. The Ocean Dome measures 300 metres in length and 100 metres in width, and is included in the Guinness World Records. It opened in 1993, and visitor numbers peaked in 1995 at 1.25 million a year. The Ocean Dome was officially closed on October 1, 2007. The Ocean Dome sported a fake flame-spitting volcano, artificial sand and the world’s largest retractable roof, which provided a permanently blue sky even on a rainy day. The air temperature was always held at around 30 degrees celsius and the water at around 28. The sand was made from crushed marble, which doesn’t stick to skin as much as regular does — meaning when you lay down you don’t get sandy. Check out the pictures below — what an engineering project!
Top 8 Yangbajain hot springs
The Yangbajing hot springs, in the Tibet Autonomous Region of China, (known to people who appreciate freedom as Tibet) provides much of the electricity for Lhasa, the capital. A thermoelectric power plant on the edge of the Yangbajain hot spring fields, which cover 20-30 square kilometers. These particular springs are so interesting because they are at an elevation of approximately 14,000 feet (about the same as the peak of Mt. Rainier in Washington State). The water emerges from the crust of the earth at 84 degrees F, which is higher than the boiling point at that altitude. The springs themselves aren’t as beautiful as some of the other locations on this list, but they have a misty charm of their own.
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