Thoenert Engraving on Paper

Pictured is one of a set of four framed engravings by Medardus Thoenert, engraver from the late 18th to mid 19th century. They all have a denotation of "Kl. Ideen Mag." with a page number, along with the signature "Thoenert fc".  All appear to be of an architectural nature, indicating a retreat house and garden structures with memorial (?) structures.  I have been completely unable to uncover any information relating to these particular engravings, other than to identify the artist's signature as identical to that from several highly-valued engravings of (then) historical figures.  Any input would be appreciated.