Old Yharnam Skip
The "Old Yharnam Skips" are a series of skips in Bloodborne in which the player exploits the vertical geography of the level in order to bypass entire sections of the area. Located at the very beginning of the "Old Yharnam" area, it is right after the first and second dialog intermissions from the Old Hunter Djura. The player must avoid various beast enemies and an onslaught of bullets from Durja in order to make the skip and land very close to the "Bloodstarved Beast" boss arena.
There are several different ways to perform the skip, but the most popular involve jumping to an invisible ledge and one involving running the ledges located on side of the building. There are several exeuction videos below showcasing a variety of different techniques and paths that result in the desired skip.