Caldecott Tunnel

The caldecott tunnel is a four-lane high way that conects  Oakland and Orinda. it also surves as an entrence to Camp Jupiter.

The Son of Neptune
Juno mentioned the tunnel to Percy while he was carrying her to the camp. Frank led the two through the tunnel to the camp. Percy noted that the furher down the tunnel they went, the more anchent it became.

Trivia
It was named after Thomas E. Caldecott, a mayor of Berkeley Hills.