In the book "Memoirs of Karl-Ludwig, Baron de Pollnitz, Volume IV: Observations made by him in inventive travels from Prussia through Germany, Italy, France, Flanders, Holland, England and other countries in letters to his friend" the reader can learn about the modern the state of the countries visited by the author. Karl-Ludwig, Baron de Pollnitz, reveals to the reader not only personal observations, but also interesting facts and nuances of the life and culture of various European nations. This book is an important source of information about the travels of the 18th century and the impressions they made on the worldview of the author.