Before the Corcoran dissolves and most of its works are distributed to other institutions, the museum is showcasing a number of lesser-seen pieces from its collection. This month, the curators highlight all manner of landscapes in the new exhibition “Terra Firma: Landscapes from the Photography and Media Arts Collection.” The images span more than 150 years and feature locations both natural and developed, places that would presumably look quite different on Google Earth now than they did a century ago. This farewell exhibition also highlights what local art fans will lose when the Corcoran ceases to exist in its current form; in this small, 30-work exhibit, visitors will see images by photography giants like Adams, Dorothea Lange, and Timothy O’Sullivan (shown). Take this crash course in photography history before the exhibition closes this fall. The exhibition is on view Wednesdays 10 a.m. to 9 p.m. and Thursdays to Sundays 10 a.m. to 5 p.m. to Sept. 28 at the Corcoran Gallery of Art, 500 17th St. NW. $8–$10. (202) 639-1700.