Offset by canary-colored spires and Italian marble, the Basilica of the Immaculate Conception is quite the sight to behold. Previous travelers say you most certainly have to stop by this church in Old Mazatlán, if not to tour the insides, then to at least snap a picture or two of the exterior. Be respectful if you do decide to go inside: The basilica holds services several times each day. But since there's no official website for this Sinaloan beauty, it'll be hard to determine the mass schedule. Our advice? Go at night when there are fewer masses. That's also when you'll see the more than a century-old church's new evening lighting.