Herbert and Dorothy Vogel - you won't recognise the names. They are an ordinary American couple with a very special collection and a greater sense of generosity. The New Yorkers worked as a postal worker and a librarian, though began collecting interesting pieces of modern art out of their modest wages. Only, the thousands of pieces crammed into their little apartment began accumulating value and soon, Herb and Dorothy were the owners of one of the biggest collections of modern art in the world.

Herb and DorothyHerb [L] and Dorothy [R] With Part of Their Art Collection

In 1992, the couple donated their art to the National Gallery of Art, making their collection available to the public free of charge. 16 years later, they announced they would launch a gift project entitled The Dorothy and Herbert Vogel Collection: Fifty Works for Fifty States in which they donated 50 pieces of art to 50 different states, given no gallery in New York was big enough to house their full collection.

Sadly, Herb died in 2012 and the exhibitions closed, though a wonderful new documentary by Megumi Sasaki highlights their extraordinary story. Herb and Dorothy 50x50 is set for release on September 13, 2013 and critics have been unanimous in their praise.

"If Ripley's Believe It or Not! were still around, Herb and Dorothy Vogel would surely be in it for amassing a world-class art collection on the most ordinary of working-class salaries," said Kenneth Turan of the Los Angeles Times.

Watch the trailer for 'Herb & Dorothy 50x50':

"Delightful, involving doc about an unlikely couple who became pioneer contemporary art collectors with working-class salaries," said the Hollywood Reporter.

"The Vogels [Herb and Dorothy], sitting in their same old apartment, overflowing as ever, make for charming company," said the New York Times.

Herb and DorothyHerb [L] and Dorothy [R] In Their Bulging Apartment