The cemetery was established in 1844 so it was there for...
The Civil War
Lincoln's presidency and assassination
The turn of the century
The sinking of the Titanic
Two World Wars
The Civil Rights movement
The moon landing
The Vietnam War
Rise and fall of the Iron Curtain
The turn of the century again
9/11
35 U.S. Presidents (and 43 presidential terms)
Among other events, and the list goes on...