Inside the Salt Cathedral at Zipaquira:

Photographer: Nacho Libre
From: Day 96 - Indecent Proposals, Caffeine cultivation for beginners and not a sight of Señor Sanchez
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Inside the Salt Cathedral at Zipaquira:

This enormous network of caverns and the imposing high ceilinged cathedral have been created 180m below the surface in an old underground salt mine. I licked the walls to check.