Guggenheim Bilbao should be on every world traveler’s bucket list. An icon of 20th-century architecture, this groundbreaking Frank Gehry-designed masterpiece was a game-changer for architects and aesthetes alike, as well as for the citizens of Bilbao. Constructed on the site of a post-industrial wasteland in this once thriving port city, the museum, which first opened its doors in October of 1997 after four years of construction, breathed new life into Bilbao and the surrounding Basque region. The prosperity that ensued…