<DIR>These verses in 2Kings are excellent illustration of the spiritual world (angels) all around us. We don't see them (unless God chooses to open our eyes) but they are there!
2Ki 6:15 And the servant of the man of God arose early and went out. And, behold, an army surrounded the city, and horses and chariots. And his servant said to him, Alas, my master! What shall we do? (16) And he answered, Do not fear, for those with us are more than those with them. (17) And Elisha prayed and said, I pray You, Jehovah, open his eyes so that he may see. And Jehovah opened the eyes of the young man, and he saw. And behold, the mountain was full of horses and chariots of fire round about Elisha.
If you'd like to read books about the spiritual realm, I've read two that I really liked. They are "This Present Darkness" and "Piercing the Darkness" both by Frank Peretti.</DIR>