Brooklyn Bridge and Lower Manhattan Walking Tour with Optional One World Trade Observatory. Walk across the Brooklyn Bridge, then explore Brooklyn Heights, DUMBO, Lower Manhattan, and the 9/11 Memorial on a 5.5-hour guided walking tour with an optional upgrade to include the One World Trade Center Observatory. This small-group experience is the perfect way to enjoy New York’s unique neighborhoods while taking in must-see sights and landmarks along the way. Book and Save 10%! Brooklyn Bridge and Lower Manhattan Walking Tour with Optional One World Trade Observatory.