What you are about to read is purely a hypothetical that I didn't do.
So, there is a really cool abandoned textiles factory in Windsor that I have always wanted to go and explore. Upon a quick Google search, I have learned that the building is almost 130 years old and stopped it's operations in 2005. When my theoretical partner in crime and I got there we were seemingly blown away by how big the place was on the inside. There were supposedly many alcoves and places to explore within.