Bava Batra 100 - 1st Day of Rosh Hashana - October 3, 1 Tishrei

One is not allowed to block public access from a path in one's property that has been used by the public. However, if the owner designated an alternate path, the owner cannot block the public from using that path either. Why is that the case? Are there different opinions regarding this issue? The Mishna delineated the minimum size for an individual's path, public path, etc. The Gemara quotes some alternate opinions, some other cases not mentioned in the Mishna, and explanations for some of the sizes. There is a custom to stand and sit at least seven times on the way back from a funeral. Details of this custom are discussed. If someone buys a burial cave or hires someone to build a burial cave, what are the minimum measurements assumed and how many burial spots should there be?