This is an odd story that you wouldn't expect to be possible in this era of heightened security. There is actually a library that straddles the US-Canada border between Vermont and Quebec. While the entrance is in the United States, people can also enter from Canada without going through customs inspections.
Which is why this library became the focal point of an alleged smuggling ring, with guns being smuggled into Canada. According to wcax.com, the guns were purchased in Florida and brought into the library in a backpack, and left in a backpack. They were later picked up by another person and taken into Quebec.
The alleged smuggling operation dates back six years. Back then, everyone entered the library from the United States. But in 2013, the library added an entrance for people coming from Canada. Please exit by the same door you entered. (Because we'd hate the Haskell Free Library to build a border wall).
[A black line marks the international boundary at Haskell Free Library. Photo via Wikimedia Commons]