National Hispanic Heritage Month -- September 15-October 15

Quoting the opening paragraph of this site:

The National Register of Historic Places is pleased to help foster the general public's awareness, understanding, and appreciation for Hispanic culture during National Hispanic Heritage Month. As part of the celebration, this site highlights various publications, properties listed in the National Register, and National Parks that deal directly with the ingenuity, creativity, cultural, and political experiences of Hispanic Americans. Join the National Register of Historic Places in recognizing and exploring the achievements of a people that have contributed so much to American culture.

Check out National Hispanic Heritage Month.