Dublin Explorer - Loftus Arch. There are so many things in our environment that we are so used to, we don't even ask the what, why, who and where questions. During a late night Facebook discussion I got talking to my colleague of yore, Alastair O Liathain, about Loftus Arch in Rathfarnham. At that point, I didn't even know that it was originally the gateway to Rathfarnham Castle, from which it is now separated by thousands of houses. Alastair is a fund of knowledge and a font of passion on the subject, having been the first of the 'Arch Angels', a group who put together the necessary funds to restore this magnificent building.