On Wednesday, June 15, don't miss a fascinating evening with two of the nation's leading historians talking about cultural and historic sites here in Boston and across the United States -- and what makes them essential.

Acclaimed author David McCullough and expert historian Brent D. Glass, Director Emeritus of the Smithsonian National Museum of American History, will discuss the importance of experiencing and preserving our essential historic sites and their stories: the compelling struggles for democracy and self-government; the dramatic impact of military conflict; the powerful role of innovation and enterprise; the inspiring achievements of diverse cultural traditions; and the defining influence of the land and its resources.

Book sales of 50 Great American Places: Essential Historic Sites Across the U.S. and signing by Brent D. Glass will follow the program.