Do such places exist anymore? Great question.What made the ground holy? My guess is it was (past tense) Holy because of the presence of God. If I am not mistaken in the ancient customs if your feet were clean, you were clean. We see this as Jesus washed His disciples feet. I do not propose to know the mind of God, but it appears that God was emphasizing His presence to Moses and Joshua. Therefore requiring a sign of respect and submission to the Lord from the heart level.Where is the presence of God today? The Holy Spirit is present in each believer.We are the living Temple of God.We are commanded to be holy.Where two or more are gathered in Jesus name He promises to be there among us.I would propose, that wherever God's children are gathered in worship, obedience, and prayer is holy ground. Not because of the location, or the people, but because of the Awesome Presence of God.Should we take our shoes off? In the physical sense I do not think it is necessary, however in the spiritual sense yes, we take our shoes off and exchange our dirty rags for the white robes of Jesus Righteousness and His Holiness. We are anointed with the power of the Holy Spirit. This is how we prepare ourselves for worship, prayer, and study. This is how we pray in the Spirit, we open ourselves and yield ourselves to the Holy Spirit.