Salty
It might not be one of the Seven Wonders of the World, but the Salt Cathedral of Zipaquirá is regarded as "the first wonder of Colombia."
You must descend 600 feet underground, through a former salt mine to see this architectural wonder, built entirely of salt.
Photo: Remi Jouan, CC BY-SA 3.0
https://commons.wikimedia.org/wiki/File:Zipaquira\_-\_Catedral\_de\_Sal\_(15).JPG
https://www.npr.org/2019/04/20/714609074/colombias-salt-cathedral-is-a-marvel-of-architecture-and-a-popular-house-of-wors