The tree of life carved in salt. More correctly, carved into the wall of a salt mine, complete with a real boy climing on it.
This is in the Catedral de Sal (Cathedral of salt), Zipaquira, Colombia. Zipaquira is a salt mine with a Cathedral about 1km below the surface of the mine. I had the opportunity to visit when I was in South America last month. My tour guides were a wonderful family (this is their son Andreas) that I met through work there. I will write more about my (mis)adventures in South America another time.