Not sure what it is but there's something special about doors. Maybe it's that there's something different on the other side, something we may not have experienced before, something mysterious, or pleasant, or even frightening. Maybe it's the endless variation in the designs, even though they perform the same function and have the same basic shape. And it doesn't seem to matter whether we're on the outside looking in or the inside looking out; there is mystery and excitement either way.
During a recent trip to Oaxaca, Mexico I found a number of very interesting doors. One interesting feature of the architecture there is the frequent use of ornamentation and bold colors. Many of these doors are old, from Mexico's Spanish-colonial period, but there are sites that are much older than that, dating from centuries BCE from the Zapotec, Mixtec, and Axtec cultures. The bright mid-winter light made many buildings, including their doors and windows pop and sparkle.