You can visit and tour the State Capitol Building at 107 North Main Street.
The State House is the oldest State Capitol Building in the United States in which the state legislative bodies still meet in their original chambers. The imposing structure, built of New Hampshire Granite in 1815-1818, is capped with a beautiful gold dome which is both a landmark and a monument.
The State House Visitors Center is open year round. It is open to the public Monday-Friday from 8am-4:30pm. Self guided tours may be taken any time. Guided tours are scheduled for groups of 10 or more.

Then there's the Museum of NH History at 6 Eagle Square,
{click here for a 2 for 1 admission coupon}

Also the Tuck Library at 30 Park Street,

And our wonderful Red River Theatres at 11 South Main Street.

If the kids need to run around and burn off some energy before getting back in the car, try Kimball Park, off North State Street, or White Park, at the intersection of Washington and Centre Streets.

Read what one visitor to Concord had to say about Downtown Concord things to do & see here at Go Nomad.com

Visit these sites for more Concord information:
*Main Street Concord
*City of Concord, NH
*Concord Chamber of Commerce