What beautiful things are named in the first lines of each stanza of “America the Beautiful”?

There are four stanzas in the song “America the Beautiful” by Katharine Lee Bates (1850-1929), originally published in 1895 and revised in 1904 and 1911.

The stanzas begin respectively with these lines:

1. 0 beautiful for spacious skies
2. 0 beautiful for pilgrim feet
3. 0 beautiful for heroes proved
4. 0 beautiful for patriot dream