Usually, a staircase will be completely secured and supported in order to make it safe for climbing up and down. This is what a carpenter should do and must do when they are building a staircase. So, this is not possible if there is no support for a staircase since it will be a danger for the users. However, although this is not possible, in reality, it can be possible. A stairway from Loretto capel is the proof of this impossible happening. The stairway was built in 19th century without any nails for supporting the construction. The incredible thing is that this staircase is still in a good construction and even it strongly stands today. This is why this staircase called miraculous staircase.
Just like the name, this staircase is like a miracle as if it was built using a magic that without any nails or supporting it can strongly stand from 19th century until now. You may have known about the story of miraculous staircase where that time a stranger man came to help the nuns building a staircase so that they can climb up to the top level. They spent 19 days to pray to St. Joseph before the coming of the stranger man. The man himself constructed and made the staircase with even no central support, so no one knew how it stood so strongly without any support. This is not only no support, but there is also no nail and glue on the staircase. It became stranger, when the man suddenly disappear without even asking for the payment. People assumed that the carpenter is St. Joseph himself, but there was no certain answer.
Miraculous staircase has three mysteries that make it so popular. The first is that no one knows who the carpenter is, the second is that even the scientist can’t find out how this staircase built without any support, nails and glue and the third is the wood of the staircase that even can ‘t be found in the entire region.