The warehouse where I work at used to be the old Kessler Brewery in Helena, Montana. It was built in the late 1860s and has somewhat of a storied past of entrepreneurialism and prohibition era industry. The building has been demolished and rebuilt a hand-full of times, but the original 'core' of the building still exists and has been converted into room after winding room of storage. Badly damaged in 1935 by earthquakes that rattled Helena, no less than 2 men lost their lives inside the building over the centuries.
It truly is a wondrously old place to earn my living. We are constantly finding false-walls and doors that lead to bricked off nowheres. A few months ago we discovered a small sealed wooden box at the end of a narrow tunnel leading 5 feet deep into a wall (we opened it, it was empty). A few days ago we moved a shelving unit to discover a door (we opened it) that led to a small empty room that looks like it hadn't seen light in decades.
Broken wine bottles are frequently discovered in the morning when we arrive, smashed in the middle of aisles of three-tiered wine storage racks. Perhaps we should put an end to opening of sealed boxes and rooms...