This post office in Sanquer, Scotland has been in continuous operation since 1712. Back then, the mail was delivered by “runners” who would use the post office as a “change-house” to rest, switch horses, and exchange mail bags before continuing their deliveries.
While it is not the world’s first post office, it is the oldest one to have remained in continuous operation all these 300 years and it is eight years older than its closest rival in Stockholm, Sweden. It is interesting that a post office could be in continuous use for 300 years. It is a testament to the power of a good location, superior construction techniques, and a government monopoly.