The Ebro River carved La Rioja's valley over millennia, depositing the clay-limestone soils that now sustain 65,000 hectares of Tempranillo vines. Spanish winegrowers have worked this high-altitude terrain since Roman colonization, but the region earned global recognition only after phylloxera devastated French vineyards in the 1860s and Bordeaux vintners arrived with oak-barrel aging techniques. Today La Rioja remains Spain's most prestigious Denominación de Origen Calificada, a status shared with only one other Spanish wine region. The landscape shifts abruptly as you leave Bilbao's industrial waterfront and climb into the Montes de Vitoria. Within ninety minutes the Guggenheim's titanium curves give way to terracotta-roofed bodegas and geometric vine rows that stripe the hillsides in autumn gold and rust. Modern architecture has found a second home here: Frank Gehry's undulating Hotel Marqués de Riscal rises from an 1858 estate in Elgueta, while Santiago Calatrava's cantilevered Ysios winery mirrors the Sierra de Cantabria's serrated ridgeline. These landmark structures sit alongside medieval cellars tunneled into the hillsides of Haro and Laguardia, some still storing vintages in clay tinajas. A rioja wine tour from bilbao typically anchors in the Rioja Alta or Rioja Alavesa sub-zones, where elevation tempers the summer heat and extends the growing season. Guided cellar visits reveal the Denominación's aging classifications: Crianza, Reserva, and Gran Reserva each dictate minimum oak and bottle time, and tastings often span three or four tiers within a single bodega. Many tours pair winery stops with Laguardia's walled old town or Vitoria-Gasteiz's medieval quarter, where pintxo bars serve croquetas and salted cod alongside young Rioja served en jarra. The region's harvest runs late September through October, when the vine leaves turn crimson and cellar doors open for vendimia tours that follow the grape crush from field to fermentation tank.