I vaguely recalled there were buildings that straddled the US/Canadian border, but today a friend tipped me off to the American Prohibition phenomenon of purposely building bars that straddled the border, bars known as "line houses".
'While Border Patrol agents were on the hunt for smugglers, everyone turned a blind eye to the "Line Houses," buildings that sat on the border which were converted to bars on the Canadian side and "information stops" on the American side. Run by mob families, these were popular destinations, Wheeler said.'
The US/Canadian border
tolerates a fair share of disorder.