Polish nobility. He travelled through territories of today's Germany, Belgium, the Netherlands, where he admired the siege of Breda by Spanish forces, France, Switzerland to Italy, Austria, and the Czech Republic. It was an educational journey and one of the outcomes was introduction of Italian opera in the Polish–Lithuanian Commonwealth. The custom flourished from about 1660 until the advent of large-scale rail transit in the 1840s and generally followed a standard itinerary. It was an educational opportunity and rite of passage. Though primarily associated with the British nobility and wealthy landed gentry, similar trips were made by wealthy young men of Protestant Northern European nations on the Continent, and from the second half of the 18th century some South American, US, and other overseas youth joined in. The tradition was extended to include more of the middle class after rail and steamship travel made the journey easier, and Thomas Cook made the "Cook's Tour" a byword. The Grand Tour became a real status symbol for upper-class students in the 18th and 19th centuries. In this period, Johann Joachim Winckelmann's theories about the supremacy of classic culture became very popular and appreciated in the European academic world. Artists, writers, and travellers (such as Goethe) affirmed the supremacy of classic art of which Italy, France, and Greece provide excellent examples. For these reasons, the Grand Tour's main destinations were to those centers, where upper-class students could find rare examples of classic art and history. The New York Times recently described the Grand Tour in this way: The primary value of the Grand Tour, it was believed, laid in the exposure both to the cultural legacy of classical antiquity and the Renaissance, and to the aristocratic and fashionably polite society of the European continent. Emergence of leisure travel Leisure travel was associated with the Industrial Revolution in the United Kingdomthe first European country to promote leisure time to the increasing industrial population. Initially, this applied to the owners of the machinery of production, the economic oligarchy, factory owners and traders. These comprised the new middle class. Cox & Kings was the first official travel company to be formed in 1758. The British origin of this new industry is reflected in many place names. In Nice, France, one of the first and best-established holiday resorts on the French Riviera, the long esplanade along the seafront is known to this day as the Promenade des