Mark 13: Jesus and the temple of Jerusalem

The temple of Jerusalem was very different from any church nowadays. The temple gathered the Jews from many parts of the world to celebrate three annual feasts, mainly the Passover. There is no church that gather all Christians to celebrate some event. Besides, the temple was the place where the Lord was present, where He lived, so it was some kind of heaven in earth.
Jesus revealed - the temple was to be destroyed:

2 Jesus said, “You’re impressed by this grandiose architecture? There’s not a stone in the whole works that is not going to end up in a heap of rubble.”

14-18 “But be ready to run for it when you see the monster of desecration set up where it should never be. You who can read, make sure you understand what I’m talking about. If you’re living in Judea at the time, run for the hills; if you’re working in the yard, don’t go back to the house to get anything; if you’re out in the field, don’t go back to get your coat. Pregnant and nursing mothers will have it especially hard. Hope and pray this won’t happen in the middle of winter.

19-20 “These are going to be hard days—nothing like it from the time God made the world right up to the present. And there’ll be nothing like it again. If he let the days of trouble run their course, nobody would make it. But because of God’s chosen people, those he personally chose, he has already intervened.

In fact, the early Christians kept these words. In 70 AD , Jerusalem was destroyed but a lot of Christians were saved because they understood that general Titus was the monster of desecration so they fled to the mountains.
Due to the destruction of the temple and Jerusalem, the sacrifice of animals stopped.
Jesus is the lamb of the Lord that takes away the sin of the word. The Lord provided a way to stop the sacrifice of animals that was pointing to Jesus.

In a way, Jesus was the temple - He was the place on earth where heaven and earth met.