7. Wooden Pilings in the Water Show Where Subway Train Tunnels Are Located Under Brooklyn Bridge Park

Throughout Brooklyn Bridge Park, wooden pilings can be found in the water. Gaps between the sections indicate where train tracks are located. The A and C trains run directly underneath the two open sections seen in the picture above, by Pier 1. According to amNY, under Pier 2, you can see two openings that mark where the 2 and 3 trains run.