For more than 50 years, the Collins Castle stood sentry over Newport Harbor. The concrete mansion once rivaled the stately Balboa Pavilion—five years its junior— for the attention of boaters on the bay. Located on tiny Collins Island, which is one of three islands that make up Balboa Island, the castle was built by Balboa Island's original developer, W.S. Collins, in the early 1910s and has been a part of Newport Beach lore ever since.