Since 2001, New York City photographer John Yang has captured in amazing detail the beauty of the landscape around Thatcher Park, fifteen miles west of Albany, New York. The park is marked by a massive wall of rock nearly 1,100 feet in height, known as the Helderberg Escarpment. It is a prominent geological feature that marks the landscape and defines the northern limits of the Helderberg Mountains, the third most significant mountain chain in New...