Warszawa is the capital of Poland. During the World War II it was razed to the ground by order of Hitler, around 85% of the buildings were destroyed. After the war the old town Starowka (see below) was reconstructed and now it’s an UNESCO world heritage site. The Palace of Culture and Science, built by the soviets, is the tallest building in Poland.
Pictures from the Teotihuacan pyramids close to Mexico City. Really impressive.
Teotihuacán was, at its height in the first half of the 1st millennium CE, the largest pre-Columbian city in the Americas. The city during its existence was larger than any European city of the same era including Rome.