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There are certainly more than a "few ideas for sightseeing" between Houston and Washington, but here a few to start with: the Creole Nature Trail in southwest Louisiana, the 24 mi long Lake Pontchartrain Causeway north of New Orleans, Gulf Islands National Seashore in southern Mississippi and Alabama, FDR's Little White House in west central Georgia, Stone Mountain outside Atlanta, and Hart State Park on the Georgia - South Carolina line. From Charlotte, NC you can then head north on I-77 and pick up the Blue Ridge Parkway to Shenandoah National Park before finishing up in Washington. Besides these major stops there are plenty of other great places to stop near the highways.

AZBuck