What is a marin grotto?

Question

it has to do with the blessed mother, i want to build one but dont know exactly what it is

Answer 1

a grotto is:

any type of natural or artificial cave that is associated with modern, historic or prehistoric use by humans. When it is not an artificial garden feature, a grotto is often a small cave near water and often flooded or liable to flood at high tide. The picturesque Grotta Azzura at Capri and the grotto of the villa of Tiberius in the Bay of Naples are outstanding natural seashore grottoes. Whether in tidal water or high up in hills, they are very often in limestone geology where the acidity dissolved in percolating water has dissolved the carbonates of the rock matrix as it has passed through what were originally small fissures

i think you are talking about a Marian Grotto. if you go to the wikipedia page on Grotto, there's a picture of one that you could you as a reference when making your own:

http://en.wikipedia.org/wiki/Grotto

and here is a link to yahoo image search of marian grottos:

http://images.search.yahoo.com/search/im...

those images should give you an idea of what to do when you make yours!