I live in San Marino, let me chime in!

The historic center, which is called San Marino Città, is a gorgeous medieval town and it's also part of UNESCO heritage. I definitely recommend a trip there, if you happen to be somewhere near.

When I went to school there, I regularly missed the bus so I had the chance of doing a few walks down to my home. It's a bit steep, since the town is located at the top of mount Titano at 700m of height, but it's truly charming.

When I tried to buy stamps direct from SM back in the 70s, and addressed mail to the SM post office, my local (USA) post office did not believe that there was a country with that name. He went thru their giant post office reference book and hey there it was !

BYW it had a 1500 year anniversary in 1992, yes ? I recall not reading too much about celebrations.

Maybe it was the 1700 anniversary on 2001? The official founding date is 3 September 301 AD

I hike across Liechtenstein from time to time. A very light but picturesque set of trails for one day (30-50km). I usually start at the south border in a Switzerland town, cross the country up north and enter Austria.

On a much lighter category, someone "hiked" Monaco in a straight line: https://magamig.github.io/posts/crossing-an-entire-country-i...

...and The Vatican! (I had a beer in Rome, then strolled across The Vatican and three minutes later had another beer in Rome...)

Issue with the Vatican in this context so, that major parts of it are blocked off for the public.

You could probably walk across and around the whole of San Marino in less than a full day.

... and Monaco. Choose one of the roads higher up on the cliffs