All kinds of doors

Sometimes doors are open, and sometimes they're not. Sometimes it costs money to go through a door, or it's private, or it is so locked or sealed that it's just part of the wall.

Real doors open up to mysteries, beauty, food, something scary, or boring. All kinds of things have doors.

Metaphorical or figurative doors, ditto!

Sometimes the door is interesting even if it's not open to everyone.

Hidden secret rooms and magic doors
and
zombies
photo by Ester Siroky