Looe Key National Marine Sanctuary
Big Pine Key
Much how Key Biscayne (near Miami) isn't an actual key, neither is this coral reef named after the HMS Looe, a British ship that ran aground here in 1744. This non-island sits about five nautical miles off Big Pine Key in Bahia Honda State Park and -- with 35ft rock ledges, colorful tropical fish, and miles of coral reef -- is one of the best spots in the Keys to dive.
Army Tank #1
Much like how the population of Miami has exploded since 1994, so too has the population of this 21-year-old man-made reef; except, instead of people of questionable character, it's become a popular home for numerous species of lobsters, spiny oysters, and coral sponges. This spot contains one of two sunken M60 tanks (which look antique thanks to the saltwater) along with 1,060 limestone boulders to create one of the area's most interesting local dives.