The most popular day trip from Bogotá, 50km north, Zipaquirá is a cute historic town noted for its salt mines and underground salt cathedrals. Salt was a major resource in this area before the Spanish showed up, and local mines still churn out 40% of Colombia's salt resources.
The salt cathedrals are in the mountains about 500m southwest of town. The first opened in 1954, then was closed in 1992 for safety reasons. The newer Catedral de Sal, built between 1991 and 1995, sits within the larger Parque de Sal complex (a sort of salt-themed playground – a bit cheesy) and is Bogotá's most memorable day trip.