Some Long Island history is at risk of being lost forever. 

In this month's Long Island's Hidden Past, News 12's Danielle Campbell shows us the top five places that are in jeopardy of being gone for good.

Sarah Kautz and her organization, Preservation Long Island, are the watchdogs of Long Island history. Every two years, the organization releases a list of structures identified as endangered. 

On the most recent list, is the Roslyn home of William Cullen Bryant, a 19th-century American poet and editor of The New York Evening Post for over 50 years.

Another site of concern is Idle Hour located on the Connetquot River in Oakdale. The former country estate of railroad mogul William Kissam Vanderbilt I -- last used by Dowling College -- must be officially recognized as a local landmark by the Town of Islip otherwise it could face demolition.

York Hall possibly faces the same fate. Built in 1930, on the grounds of the old psychiatric center in Kings Park, it served as a community center for both patients and residents. 

The last two on the list represent Long Island's diversity. 

The Eato House in Setauket. "It's a very early instance of African-American homeownership that we can show documentation for," says Kautz.

And the Fowler Home in East Hampton. "The Fowler House is very special because we can show that it was occupied by the Fowlers who are a family of Montauketts," says Kautz.