1. Salt Cathedral of Zipaquirá, Colombia
The fact that engineers, miners and sculptors managed to carve out a cathedral beneath 200 metres of salt, rock and minerals is a damn impressive feat in itself. But even more amazing is just how spectacular the Salt Cathedral of Zipaquirá in Colombia is. I mean, just look at it. The light filters through it magnificently, filling the chambers and tunnels with an almost neon-like haze of blues and purples. Catch it on a Sunday, and you’ll discover another quirk: it’s still a fully-functioning Roman Catholic church.