The Temple in Jerusalem
From a human standpoint, it is not surprising that Jesus' disciples, or any Jewish worshipper for that matter, would be impressed and proud of the Temple complex in Jerusalem. Look at the pictures below of a model of Herod's Temple as it existed during Jesus' day:
The buildings rivaled any in existence today, and even surpass most with their beauty. The retaining walls were made of enormous hewn stones which fit together precisely and gave the whole structure a sense of indestructibleness.
But as the New York Trade Center demonstrated, no building made by human hands lasts forever. Our works are temporal at best, and the sooner we learn this, the wiser we will be.