For those who cannot travel to Lourdes, France, there are replicas of the grotto in several countries that offer Masses as well as the opportunity to get the feeling of what the Grotto must be like. They usually have special celebrations around February 11th, the anniversary of the apparitions.
Here are a few:
Vanier, Ottowa: Our Lady of Lourdes Grotto
Carfin: the Lourdes Grotto
Emmitsburg, Maryland: The National Shrine Grotto of Our Lady of Lourdes
Litchfield, Connecticut: Lourdes in Litchfield
San Antonio, Texas: The Oblate Grotto
West Terre Haute, Indiana: The Lourdes Grotto (external link…this page will remain open)