Day 71

This marble arch was built in 1892 as a permanent replacement for a popular temporary arch erected three years earlier to commemorate the centennial of George Washington's inauguration. It sits in Washington Square Park, a long-ago potter's field (more than 20,000 bodies lie below ground here) that was turned into a public space in 1826. Located in the heart of Greenwich Village, the park was a vibrant center of counterculture during the 1950s and '60s.