Unable to answer "What kind of building is this?" – Building – relation/15397995 via StreetComplete 61.1:

There is no building in this shape

Here is a Museum! The recorded gpx is the path to and around the museum.
Thr Museum is called "MUZEU ARHEOLOGIC EPOCA MEDIEVALA"

via StreetComplete 61.1

Attached photo(s):
https://streetcomplete.app/p/292607.jpg
https://streetcomplete.app/p/292608.jpg

GPS Trace: @The5-11/traces/12024753

There is a second path and viewpoint

via StreetComplete 61.1

Attached photo(s):
https://streetcomplete.app/p/292606.jpg

GPS Trace: @The5-11/traces/12024750

Here is an official "camp site" (official sign). It's just a little space at the side of the road for 2-4 RVs parallel to the street. Camping is free as of today.
No water/electricity etc.

via StreetComplete 61.1

There is a soccer field.

via StreetComplete 61.1

Attached photo(s):
https://streetcomplete.app/p/291285.jpg

Unable to answer "Is this still here?" – Christian Church – way/692287379 via StreetComplete 61.1:

This is not the church itself I think

There are now many small pavilions, illuminated paths and rubbish bins.

via StreetComplete 61.1

Attached photo(s):
https://streetcomplete.app/p/291015.jpg

Actually it's an observation tower

via StreetComplete 61.1

Attached photo(s):
https://streetcomplete.app/p/291014.jpg

There is a parking spot!

Also with EV Charging points!

via StreetComplete 45.2

Attached photo(s):
https://westnordost.de/p/107594.jpg

Unable to answer "Do you need to pay to enter here?" for way/435706009 via StreetComplete 45.2:

There is no building here!