Chicago's Field Museum has a collection of shrunken heads made by an Ecuadorian tribe once known as the Jivaro.

NPR: Hidden Museum Treasures

The estate has been turned into an oddball museum dedicated to Vanderbilt, and a primary attraction is his collection of native arts and fauna (such as hundreds of taxidermy birds, including some extinct ones, displayed alongside shrunken heads and exotic tools).

BBC: The Great Gatsby��s Gold Coast