Arrive in "The Big Apple" and venture northwest through the Pocono Mountains to upstate New York. Cross the border to the Canadian side of the Niagara River and spend two nights in beautiful Niagara Falls. During you stay, perhaps visit the Butterfly Conservatory, Great Gorge Adventure, or Botanical Gardens. Next, travel southeast through the Appalachian Mountains to the City of Brotherly Love, Philadelphia. Explore the birthplace of American independence before moving on to the U.S. capital, Washington DC - a sightseeing treasure-trove.