The house where John Wilkes Booth conspired with his co-conspirators.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

When it opened during the final years of the embargo, all the drinks and cigars were free.

It was once the base for a series of domestic terror attacks.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Walk through the history of American pop culture.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.