The Houston Museum District currently includes 19 museums that recorded a collective attendance of over 8.7 million visitors a year. All of the museums offer free times or days and 11 of the museums are free all the time. Thursdays the Museum District gets particularly crowded because of museum free days. On Thursdays, The Houston Museum of Natural Science is free after 2 p.m., The Children's Museum of Houston is free after 5 p.m., The Health Museum is free from 2-7, and the Museum of Fine Arts, Houston is free all day (courtesy of Shell) .