Worked in IT, not construction. Anyway we needed to do some work on a network switch we had stashed on the third floor of this building on a well-known university’s campus. You opened a closet and climbed up a ladder. The 3rd floor was a hallway with dorm rooms, bathroom and showers. It led to an open living area with a fireplace. The building was an old fraternity house and had been converted to the international house on campus. It was cool. There was writing on the wall from some of the students writing baseballs scores down from the 50s while listening to a game. It was like stepping into a time machine. Old desk, beds, etc. Found an old zenith terminal from 1979 that still booted up. I’m sure there a lot more to checkout, but it was a little creepy to be there alone.
Not a construction worker, but in my old house one of the bedrooms had a small opening to the crawlspace that was made to looked like a large mouse hole.
Here’s a picture.
I am not a construction worker. I attended a private boarding school when I was younger the school itself was 200+ years old and the castle it was built around was much older. Upon exploring me and a few other friends found an entrance to a system of tunnels that ran beneath the school. The tunnels were used as maintenance tunnels for the old heating system that was once run from a gas boiler system. Originally we thought that was why they were built. We began trying to map out the tunnels and used to spend hours underneath the school during study time/ night roaming around with a measuring tape drawing it to scale. We never completed the map due to the systems enormity.
As we got further and further into the tunnels we learnt that these were much older than just the gas boiler. A new, cement tunnels seemed to extend about a kilometer in radius. Past a kilometer the tunnels got older and more dangerous. We found that they extended all the way out to a pavilion in our school. These passages were also in cement but were very clearly much older. Most of my time as a 14-year-old was spent roaming around them. It gave us passages into locked rooms, the castle (banned grounds), to the forests etc. We decorated a lot of the walls down there in shoe polish and stolen art paints. We would even smoke down there a mere few feet below the headmaster’s office.