Cycling in Madrid shared-use paths. The most important shared-use path is Madrid Río, a park located in the banks of the Manzanares River and opened in 2011. Car-shared lanes and streets (in Spanish: ciclocalle o ciclovía) are very frecuent in Madrid. They are marked with the drawing of a bicycle on the pavement, and they are speed limited to 30 km/h. In Madrid, there are many bike sidewalk paths (in Spanish: acera-bici). Some are located in O'Donnell Street or Serrano Street. Greenways (in Spanish: pista-bici) are independent cycle routes, for example the Royal Route GR-124. BiciMAD is a public service of bicycle-sharing. It
Madrid zones of urbanisation can be distinguished: The largest suburbs are to the South, and in general along the main routes leading out of Madrid. "Submetropolitan areas" inside Madrid metropolitan area: Little medieval architecture is preserved in Madrid, mostly in the Almendra central, including the San Nicolás and San Pedro el Viejo church towers, the church of St. Jerome, and the Bishop's Chapel. Nor has Madrid retained much Renaissance architecture, other than the Bridge of Segovia and the Convent of Las Descalzas Reales. Many of the historic buildings of Madrid date from the Spanish Golden Age, which coincided with the Habsburgs