Before the Second Age, Belegaer stretched from the Gap of Ilmen in the far north, where a bridge made of ice known as the Helcaraxë connected Middle-earth and Aman, to the far south, where it also connected with Ilmen and froze.
It is not otherwise mentioned until the Second Age, when the Sindarin lords Oropher and Amdír established two Silvan Elf kingdoms in Northern Greenwood and in Lórinand (Lórien).
The 3441 years of the Second Age are, for the most part, unchronicled, unlike the First Age which is largely recounted in The Silmarillion, and the Third Age, which is the time period during which The Lord of the Rings is set.
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Appendix A of The Lord of the Rings contains genealogies of the royal house of Númenor, and several sections of Unfinished Tales of Númenor and Middle-earth deal extensively with Númenor and several of its kings.
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Also, at the end of The Silmarillion, "Akallabêth", or 'the falling of a star,' recounts the fall of Númenor and its kings, and also the rise of Gondor and Arnor.
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Glorfindel died in battle during the First Age, and is the only Elf known to have returned to Middle-earth (probably around 1600 Second Age).
Sunset Park's second age began with a wave of immigration from Puerto Rico, the Dominican Republic, and El Salvador, as well as other Latin American countries.