Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A huge musical instrument played by the ocean.

A picturesque example of brute-force engineering conquering nature.

Local legend has it that an old, decaying staircase outside this cemetery is haunted by dozens of ghosts.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.