Thanks to my colleague Greg Cooper for letting me know about this great exhibit. The Smithsonian Museum has an amazing online exhibit: On the Water. The exhibit, divided by era and theme, explores physical artifacts, maps, narratives and accounts, as well as songs and stories all connected to man’s relationship with the Ocean. The exhibit, primarily focused on United States history, explores whaling, piracy, travel, and more.
In addition to content and material, the exhibit also provides numerous learning resources for educators, including lesson plans and activities.