The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Home to items never before seen by the public.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

The hide of Stonewall Jackson's equine sidekick is on display not far from where the ashes of his bones are buried.

An original apothecary from 1792.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.