Founded by the Roman general Pompey in 75 BC, the region's capital Pamplona is perhaps best known for the Fiestas de San Fernmín (July), when the encierro takes place – a tradition which involves people running through the streets in front of bulls. The city also boasts its fair share of sights including the old town, with its ancient churches and elegant buildings. Outside the city is the Sierra de Aralar, with well-marked paths of all grades. A wander through here will take you past waterfalls and caves and in Excelsis you'll come across Navarra's oldest church, the Sanctuario de San Miguel, a popular pilgrimage destination. In the south, the historic medieval town of Olite is home to an outstanding 15th-century castle, with turrets galore, and a Romanesque and Gothic church. To the west is the Urbasa and Andía Nature Reserve. Further north and in the east, the villages and valleys of the Pyrenees provide some of the most beautiful landscapes in the province and offer the perfect place to relax. Of particular note are the Valle de Baztán and the Valle de Salazar. For the more active, the Valle de Roncal is a good place to explore the mountains as is the Pirenaico National Park.