[OC]

Somewhere in the woods between Lake Como and Lake Lugano. I have no idea what the codes (e.g. 35.C) and the symbols on the top side mean.

Picture 1 to 4 shows border between Poland and Czechia . Warsaw has completed its part of the motorway. Prague has yet to begin.
Time: September 2023.

Picture 5 to 8 shows the S3 route no longer ends in the middle of nowhere. Czechia has laid asphalt near the border with Poland.
Time: 2026.

note: Yeahhh I'm forgot to changed from "Czechoslovakia" to "Czech Republic" or "Czechia". I don't know why I didn't realize my mistake. I'm apologize and deeply sorry for people of Czech Republic who read this post. 🙏

Source: Here and here

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My son and I stayed at an AirBnB directly on the Québec / New York border. The closest house to where we were staying in NY was on the cul de sac in Québec. I was endlessly pleased and drove to the other side for pictures too of the sign and where we were staying, etc. The hosts were nice and it was a super quiet farm. We took day trips for poutine a few times and the border guards were like "you sure go to Canada a lot!". The first picture is looking into Québec down the road from NY - 2-4 is from the Québec side looking over at where we were staying.

Pictures 5-8 were from the nearest port of entry, Churubuscu. This one is unique as it's the only US/Canada port that only goes from Canada into the US - Canada shut down their port of entry years back.

Along a hiking trail in Pittsburg, New Hampshire, to Fourth Connecticut Lake, headwaters of the Connecticut River. The trailhead and lake are in the U.S. but a short stretch of the trail is in Canada. No passport required! [OC]

There are no border signs nor lines to notice, and only the changed quality of road was the obvious sign of entering into the different country.

We crossed the border during a two month paddle of the Yukon River. Fairly non descriptive except for the border stripe visible on the cliffs on one side. There is a payphone in the town of Eagle 10 miles downstream where we had to report to border patrol via a special phone on the side of the town laundromat since there’s no cell coverage.