The document discusses the Danube Delta which forms the largest river delta in Europe and is home to over 300 bird species and 45 fish species. It also briefly mentions 8 churches with varied designs that are part of the local culture in mountainous areas. Additionally, it provides details about Teide National Park on Tenerife Island which contains the Teide-Pico Viejo volcano, the highest peak in Spain and the third tallest volcano globally, located in a spectacular environment. The construction of Burgos Cathedral started in the 13th century and finished in the 15th-16th centuries, representing the entire story of Gothic art.