Walter Skold reached the milestone Monday when he visited the burial sites of Anne Whitney, William Reed Huntington and Mary Baker Eddy in Mount Auburn Cemetery in Cambridge, Massachusetts.
Eddy is best known as the founder of Christian Science, but she was also an accomplished poet.
Skold said he was half-joking when he first said he wanted to visit the graves of 500 dead poets who had at least one book of poetry published, in their lifetime or posthumously.
"I never really expected that this would go on this long and become such a focus," Skold said. "But I'm happy it has."
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Skold founded the Dead Poets Society of America and began visiting and documenting the graves of dead poets in 2009 in an effort to draw attention to dead and largely forgotten writers.
Travelling in a van nicknamed the Poemobile, he visited 150 graves in 23 states during his 90-day trek that year.
Riley has among the largest poet's graves in the US, in Indianapolis. Now in its fourth year, this year's event kicked off yesterday at the gravesite of Edna St Vincent Millay and Cora Millay at the Millay home in Austerlitz, New York.
Through the weekend, additional poetry readings are scheduled at burial grounds in New Hampshire, Massachusetts, Illinois and California.
In researching the cemetery, Winslow has identified 37 poets who are buried there. Skold is bringing those poets and their works to life, she said.
"Mount Auburn is a place of memories and stories," she said, "and what he's doing is rediscovering a lot of the stories and celebrating the art that they wrote."
Skold is hopeful he can visit 63 more burial sites he's identified in the Northeast this fall. But to get to 500 will require some additional funding, he said.
"What I have is becoming a cultural archaeological resource of the poets' graves," he said.