A Lourdes grotto is a replica of the original grotto at Lourdes (a Catholic religious site reputed to have healing properties) or a grotto honouring Our Lady of Lourdes unassociated with the Lourdes site. Some such grottoes are called simply "Lourdes grottoes", others are described as replicas, or as honouring Our Lady of Lourdes.
Among places which state they have Lourdes grottoes are:
Mariagrot Mariagrot in Sint Nicolaasga, Fryslân, The Netherlands
Our Lady of Lourdes Grotto (Lourdesgrot), a 1:13 scale replica of the Sanctuary of Our Lady of Lourdes in Massabielle (France) housed in the "RK Onze Lieve Vrouw van Lourdeskapel", in the "A.J. Kropholler Complex" , a Dutch national landmark, located in Scheveningen, Netherlands