This is the reflection pool, perhaps best known for the scene in Forrest Gump where Jenny comes running though the pool to meet Forrest, who is being presented on stage at the Vietnam War protest (remarkably well acted by Michael O'Brien aka Poose). It was also the scene of Martin Luther King's "I have a dream" speech.

Unfortunately, the reflection reminds me more of how I look when I wake up from a massive session on the sauce with a cracking hangover, rather than a crystal clear reflection of the Lincoln Memorial.