Central Park in New York City has thirty-six ornamental spans, most of which were built in the 1860s as part of the park's construction. No two bridges in the park are alike. There were three types of bridges and arches constructed in Central Park. The spans across the sunken "transverse" roads that carry crosstown traffic below the park were made of natural-looking schist, and are generally not counted as arches or bridges. "Ornamental Bridges or Archways" were larger spans integrated into the greater landscape and were made of brick, stone, or cast iron. The final category, "rustic" bridges, were smaller stone or log bridges and usually spanned small walkways or streams. Central Park had 39 bridges at its peak.