Two Polish UNESCO sites for you today, both from Martuchaa on the Postcrossing forum:
First is the Centennial Hall in Wroclaw, also known as the Hala Ludowa (People’s Hall). The hall was built in 1911-1913 out of reinforced concrete. The hall was called the Centennial Hall because it was built to honor the centennial of Napoleon’s defeat at the Battle of Leipzig. The Hall is very large. The dome is 75 feet (23 meters) high and it seats 7,000 people. The Hall was listed on the UNESCO list in 2006.
Next is the Wawel Castle in Krakow. Wawel Castle was built on Wawel Hill under the reign of Casimir III the Great in the 14th century. It was the home of the Polish kings for many centuries. Wawel Hill has been inhabited for almost 50,000 years; the small settlement on Wawel Hill eventually spread to become the city of Krakow, Poland’s second largest city. The Historic Center of Krakow, including the Castle, was listed on the UNESCO list in 1978.
Martuchaa used a very appropriate stamp on the cards, depicting Pope John Paul II, the first Polish pope, who was born in Wadowice, about 30 miles from Krakow, and who was the Archbishop of Krakow before becoming the Pope:
This stamp was a joint issue by Poland and the Vatican, released in March 2014.