When someone mails a package with the United States Postal Service in Western Pennsylvania, the first stop is this massive facility in Warrendale, where hundreds of thousands of parcels show up every night. Plant manager Steve Tarpey gives Boaz Frankel a tour of the Pennwood Place Processing and Distribution Center and shows off the speedy conveyor belts, secret trap doors and live bees (really!) as he explains what it takes to get every package to its destination.

Check out last week’s episode to visit an experimental tree laboratory in Schenley Park.