Washington DC was carved out of Maryland and Virginia when President George Washington selected the sight on the Potomac River. The city was designed and laid out by Pierre L’Enfant with numbered streets going north and south, lettered streets going east and west and Avenues named after the states criss-crossing these streets. The city was divided into four quadrants, Northwest (the largest quadrant today), Northeast, Southwest and Southeast. The land that Virginia donated for the nation’s capital was returned to Virginia. Only the land donated by Maryland remains as Washington. Since Washington is a Federal district, its borders cannot expand and thus much of the activity has moved to Northern Virgina and Suburban Maryland, or the Suburbs. The vast greenways of the capital city are great for people with dogs and almost all are open to leashed dogs. The monuments make for very scenic walks and there are quite a lot of dog-friendly activities in the Washington area.