Twilight thickens over the National Mall and the memorials shift from daylight monuments to lit stages. You meet at the Martin Luther King Jr. Memorial as the stone statue emerges from the dusk; the Tidal Basin’s water flattens the lights into long, trembling lines. The guide leads a steady route — through FDR’s water-carved rooms, past the bronze ranks of the Korean War Veterans Memorial, and along the Reflecting Pool toward the Lincoln Memorial and the Washington Monument — each site accentuated by night and quieter than the midday crush.