In which country would you find the Guggenheim Museum Bilbao?

In which country would you find Big Ben? In which country would you find Edinburgh Castle? In which country would you find the Rock of Cashel? In which country would you find the Chapel Bridge in Lucerne? In which country would you find the Prado Museum? In which country would you find Knossos? In which country would you find the Hermitage Museum? In which country would you find the Sistine Chapel?