Embed a public land
Add a live card for any site to your own web page. Cards update on their own: when the managing agency posts a closure or the National Weather Service issues a warning, your page shows it within the hour. Free for anyone to use.
A map of many places
Show every public land, or just a state, an agency, a type or the places with a Roosevelt connection, on one map. Leave a box empty for all.
Other ways to embed
Iframe map (works where scripts are not allowed, such as some content management systems):
Several sites on one map: list slugs separated by commas in the site parameter of /embed/map.html.
Your own design: use the open data directly.