Zipaquirá Catedral de Sal
Although it does not have a bishop and therefore is not a true Cathedral, the Catedral de Sal in Zipaquirá, Colombia is as majestic as anything else with the name. Deep in a former salt mine, as you enter, you will pass 14 small chapels, representing the stations of the cross - each with a cross sculpted out of the halite. Go deeper, and you find three naves, representing the birth, life, and death of Jesus. Further down, you'll find a labyrinth of shops selling souveniers, jewelry, and snacks.