A Sprout Space classroom was built by Perkins+Will architects next to the National Building Museum to show how a classroom can be environmentally friendly. The roof features solar panels and a mechanism for collecting rainwater. (Sam Kittner)

Learn more about schools that have green buildings or projects — including Manassas Park Elementary in Virginia and the Barrie School in Maryland — at an exhibition at the National Building Museum.

What:Green Schools.”

Where: National Building Museum, 401 F St. NW. First floor. Be sure to check out Sprout Space, a green temporary classroom located outside the museum.

When: Through January 5. Monday through Saturday 10 a.m. to 5 p.m., Sunday 11 a.m. to 5 p.m.

How much: Exhibition is included in museum admission. Adults $8, $5 ages 3 to 17, free age 2 and younger.

For more information: Have your parents call 202-272-2448 or visit www.nbm.org.