Access available at places like The Smithsonian is irrelevant if visitors are not aware of it. The appropriate symbols (e.g. assistive listening devices, captioning, American Sign Language interpretation) and information should be listed consistently in the same format on each website across all federal agencies. Not having a consistent format leads to information not being posted, accurate and potentially using politically incorrect language which may be offensive.
Some excellent examples of web sites are:
The access information is located by going to "Visit Us" and then to the section on "Access" or "Accessibility.” All of the information is then sorted by disability. The symbols should appear on the left and the appropriate information on the right. I would be happy to submit a template that I have prepared.
For your reference, the following website has all the access symbols formatted for easy downloading.