The small doors of Elvas
A quaint thing we observed walking around the streets of Elvas was the size of the doors -- a lot of those in old reconstructed houses were small! We have never heard of an explanation for this, but it seemed odd that anybody who goes in would have to bend down, and considerably so, to enter.
Also, note that no matter how small these doors are, the upper half of it can be opened inward, so that it serves like a balcony or window where the owner can look out, or where the neighbors can look in for a bit of gossip.
This is exactly what we found as we were walking down a street, a neighbor having a friendly chat through this "window-door". Note the door's size by comparing it with the neighboring building's entrance which is of normal size.