Jesus performed many miracles, signs and wonders right here in our physical, natural world. He claimed that all He did was at the directive of the unseen God, by the power of the Holy Spirit. That reality is not easy to grasp without revelation.
If you count that which is unseen as superior to what is reasonable, naturally understandable and visible, you may peer into eternal things. While not all unseen entities are good, Jesus' revelation is reliable and leads lifeward. Should you trust and follow Him, many people will count you at least odd, or worse, as though you've lost your bearings.
If you choose your own natural faculties of seeing, feeling and understanding as the anchor for your existence, you will have the comfort of many comrades. But you will in the course of life continue to encounter events, signs and phenomena that you cannot deny, but have no means of comprehending or categorizing. Things too wonderful to explain, and far beyond your reach.
Do you wish to see into eternal, invisible realities? Would like to explore "the land from whence the shadows fall?"
Be childlike. Use a little faith. Simply ask, and the Prince of Life, Jesus, will reveal Heaven to you. When you're not watching, His whole Kingdom will begin to unfurl inside you. Yes, signs and wonders.