At the entrance to the security lock for the port in MANNHEIM City...

>> ... the exit to the harbor ...

the second shot is more like it, because you have access, personally, I'm afraid of closed spaces, unfortunately.
The photo is quite interesting!

... if you're not alone, that's O.K., Lucy. A door / gate always opens

Even if not one... Well, on top of the sky! Thank you for trying to reassure, but phobias are not treated... Sorry for the digression. Thank you for your attention and participation, Gerd!

... only courage and a good companion will help

You are right, Gerd. Once I helped a priest, when we pilgrims went into the cave, and there before the release of 28 meters, but I decided to go as the team leader wouldn't let me, knowing about my illness. Fear again swept over me and I left... Then went into a small recess where shone the lamp and stood the icon of the virgin Praise to Kyiv Pechersk. I was light and spacious, the walls parted... like I seemed to be floating in the clouds, and then went back to our group.

Люси посещала Киево-Печёрскую Лавру?)

That was a good decision, Lucy. If you can, take a boat trip through a lock. You're not alone on the ship, so you do not have to be scared. It is worth a try it.

Of course, it's worth a try! But first I must take a blessing from the priest!

...good luck