The Temple Mount (Har Habayit) is the hill in Jerusalem where the Holy Temple once stood. Although the Temple is no longer standing, the Jewish sources discuss whether a Jew is allowed to even step foot on the Temple Mount because of its holiness.
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It was stated: Nobody should enter the Temple Mount in shoes, with dust on his feet, or his coins tied up in his head-scarf, or his money belt on him outside. What is the reason? (Eccl. 4:17) “Watch your feet when you go to God’s house.” Rebbi Yose ben Yehudah says (Esth. 4:2): “He came as far as the king’s gate because nobody may enter the king’s gate in sackcloth…