Hi abtal,
Welcome to the Forum.
The
Recovery directory you mentioned is not an empty directory. It contains a sub-directory WinRE which contains the files necessary to run the Windows Recovery Environment when things go wrong with the operating system,
in particular the Windows Recovery image file.
These files are protected by the System, hence not appearing at first glance.
Below is an image of what you'd typically expect to find inside this directory:
You can delete the Recovery Directory if you feel the need to save space, however, doing so would result in you being unable to run the Windows Recovery Environment to attempt to repair Windows in the event of file corruption.