I dislike the Guggenheim in Bilbao (design wise), it's just not my idea of architecture.
Mind you, it isn't as bad as Melbourne's Federation Square, which is a scar on the face of the city (one of many scars);
But this takes the buscuit in the ugly, modern architecture category. It's Frank Gehry's latest creation, and is actually the Hotel Marqus De Riscal. It's being built (has been?) in the Rioja wine region of Spain. And it's ugly.