At an old abandoned factory in Toronto, the first time I went was at night, the sun had long set.
I was holding a flashlight that could fit into the palm of your hand. The light range wasn't too great.
On the second floor, there was a green hallway - the light shone revealing frantic hand painted runes. These runes were on everything, just scribbles everywhere.
I turned into a room and I was met with red handprints and more runes. It was surreal and terrifying. Behind me was a huge pillar with a tarot style drawing of a bird human. I had to stand still for a solid 5 minutes because I became paranoid that a person might emerge from the darkness.
Here's the same place, but during daytime when I went to go face my nightmares.
Luckily this place is now entirely demolished and rebuilt into condos.