Great Diamond Island

After the base was decommissioned, the bunkers and residences were left idle for over 30 years before being developed and sold to private citizens.

The Diamond Cove properties are on the grounds of the former Fort McKinley, making use of the army barracks and officer's quarters as renovated homes.

The abandoned concrete coastal artillery batteries exist in the woods at the east of the island, although they are technically private property and off-limits due to safety concerns.

A limited number of homes have been built on the waterfront areas of the island; many have been featured in local magazines and newspapers.

In a 2010 GQ magazine article about the coolest small cities in America, visiting the Diamond Cove General Store to get a lobster roll made their list of four must-see places in Portland.