I want to know the answer to the following question:
When did Travel + Leisure list Yale as one of the most beautiful campuses?
All the background I'm provided with is that "Yale also owns and has restored many noteworthy 19th-century mansions along Hillhouse Avenue, which was considered the most beautiful street in America by Charles Dickens when he visited the United States in the 1840s.". Is that enough to answer the question?