Long read- Ive had several experiences, but the scariest is this one- be me at about 23yrs old and working for a small local owned flooring company. My boss had rented out a bigass warehouse at the train depot/port area of Anchorage, AK and it was a really old building. As you walk in one of the first things you are met with is a giant round vault door about 6 feet in diameter to your left that’s really old and locked, an empty office in front, and a short flight of stairs(about 10 steps) down that lead to the main warehouse area where there is a rolling door on the complete other side of the warehouse and the power box was across on the wall between there, so basically I have to do a big triangle across an empty and next to pitch black warehouse other than dim backup lights every now and then that just made it creepier. Boss wanted me to go in, turn on the power and lights, and open the door for him. Its about 8pm and we have a night gig to work across town so we gotta hurry and load tools and materials. He drops me off at the front door and I go down the stairs and immediately feel creeped out and feel as if being watched. I shake it off and just head to the power panel. As I’m about to get to it look down into the warehouse to my left for some reason and swear I saw a shadowy silhouette of a man standing partially behind a support pillar looking at me. My hairs stand up and I flick the lights on and look back and nothing there. I am a bit freaked now so I hurry and open the door and we load the stuff, he pulls out, I close the door and head back to turn off the power. As I’m walking back, out of my peripheral to my right I see the man again by the same pillar and look but it wasnt there. Toss it off as my mind playing tricks on me because its already creepy there. I turn off the power and because I’m creeped out I fast walk like an old lady at the mall to the stairs with my eyes darting side to side. I get to the stairs and as I’m putting my foot down on the first step(fuck I’m getting chills again typing this) I hear a very loud smack right behind me as if someone clapped their hands really hard and so I fucking book it up the stairs. As I’m going up there is only what I can describe as someone very heavy and wearing boots running up the stairs right fucking behind me freaking me absolutely the fuck out and I fly up the stairs, get to the top, and spin around ready to knuckle dust some bum that broke into the building. But there was fucking nothing there. No one. Nothing. I run out the door and jump into my bosses truck and he saw me run out and hop in his truck and saw my face and said “see, that’s why I had you go in there, that place is fucking scary haunted.” I am not making this up, this is 100% what happened as detailed as I can remember. TL:DR- ghost scared me out of warehouse and boss knew about it and is why he sent me in alone.