I notice that some expressions of Marian devotion suggest saying prayers and lighting a candle at a Marian altar.
In an older church that I occasionally attend, there are two side altars, one to the Sacred Heart of Jesus and one with a statue of the Virgin.
In the modern church that I attend more regularly, it seems more confusing. Both side altars are set into cubbyholes in the walls and have multiple statues; one is the Holy Family, and the other is shared by Guadalupe and St. Anthony. Are either of these "Marian altars"? They both have a representation of the Virgin, but not exclusively. Thanks!