The spirit realm is all around us, everywhere we go. We live in their space. Spirits are higher beings, people like you and in, in a much greater dimention of timelss and loving notion. Demons are the same, they live in a realm right in front of us. Places, are not haunted. People, through two laws of attraction ( Abuse, alcoholism, drug abuse or general bad energy ) can attract bad entity's or spirits through their own realm and into ours. And the law of invitation. Occault practices, Ouija board, Black books, spells hexes dark arts and many more, can invite something directly into a place or person. The best place to communicate with spirits is church. She gives us a spirit non of us can ever appreciate enough. The Holy spirit. there are 3 stages to the demonic hauntings.
Infestation. Whispering, knocking, footsteps and recurring nightmares. Thoughts that you would consider not your own or disturbing,
Oppression. Bad smells, rappings, feeling of being watched, physical abuse. Sudden depression, withdrawal from family and everyday activities.
Possession. Disgust, disturbed or hatred towards anything considered Holy, bless items or the house of God being church, or the people with in it. Outwards manifestations such as the levitation of objects, people, hysterical laughter or screaming. Inhuman strength, the sudden ability to speak in unkown or dead languages. Tears of blood, self harming, physical appearences changing, contortion of the joints, blasphamy or hate towards God.
There are many many more we can list here.
However fear not, even in the stage of possession we have a chance of coming back. The soul is pure energy, the same as these spirits, demons and other beings. It can not be destroyed, the soul/spirit in us is a gift of free will, and it is the part that can fight back. Through the lord Jesus Christ we stand the greatest chance of all. Remember the Devil is already defeated. Most activity can be explained away. However, not all spirits are bad either. Remember that the only way they can make themselves known is sometimes the ways that can scare us into thinking there is something bad there. Listen to your heart. If it really, really scares you it can be something bad. No matter the activity there is help out there.
They have no time, no distance or concept of the world being one place. We as humans are simply a vessel for something inside of us so much greater than our own concept of anything we can imagine. Our spirit, once we die, is unrestricted in ability and knowledge of the entire universe. The human body restricts this, and until physical death we are simple here to love, learn and thank God for our time available to us here. Once we see that this is nothing but the blink of an eye, we can learn to appreciate the thing's we have and stop wanting thing's we do not need because the only thing we need here on earth is simple. Faith.