What is referred to by 'a butterfly in barcelona'?

Based on the clue 'a butte mansion has some of william clarks art col...', what is the answer? What is associated with: a butter made from this nut really a legume was developed in 1890 promoted as a health food at… Based on the clue 'a butterfinger blizzard or a peanut buster parfait', what is the answer? Based on the clue 'a butterfly expert he wrote much of lolita while o...', what is the answer? Based on the clue 'a butterfly table is also known as a drop this ta...', what is the answer? Based on the clue 'a button warned this man in 64 hot water in 65', what is the answer? Based on the clue 'a buzzard flies overhead inspires the cast of thi...', what is the answer? Based on the clue 'a bypass operation may bypass the carotid or coron...', what is the answer?