And it's not because of the Indians/Browns/Cavs. No, it's really not because of them. Look what one may see in just a day or two of sightseeing [or time killing]:
Cleveland Museum of Art
Crawford Auto Museum
Severance Hall
The Museum of Natural History
The four places above are all in the same neighborhood [which is also the neighborhood of the Cleveland Clinic and University Hospitals, not to mention a nice, large park] and easy walking distance from one another. In addition, in the same area are found the African American Museum, Cleveland Botanical Gardens, The Health Museum of Cleveland, and The Western Reserve Historical Society Museum and Library.
Of course, about a ten minute drive away, is this place.