And if you go to Put-in-Bay, you can tour the island's geode for yourself. Read more: 25 Gorgeous Islands For Vacationing That Won't Break The Bank Inside the world's largest geode, which can ...

Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?

'Geode was an idea that was in our minds even before Tippet Rise was established,' says its co-founder Cathy Halstead. The massive 12.5 thousand acre (5,058 hectare) sculpture park, located in the ...