The Destruction of Jerusalem and the End of the World.
The beginning of the discourse:
Related Commentaries of Luke 21:5
Luke 21:5-7
5 And as some spake of the temple, how it was adorned with goodly stones and gifts, he said,
6 As for these things which ye behold, the days will come, in the which there shall not be left one stone upon another, that shall not be thrown down.
7 And they asked him, saying, Master, but when shall these things be? and what sign will there be when these things shall come to pass?