As visitors and locals alike will attest, there is no other place in America quite like Key West. Separated from the Florida peninsula by more than a hundred miles, the island city lies closer to Havana than Miami. The archipelago to which it belongs not only boasts the only tropical climate in the lower forty-eight, but also features flora and fauna found nowhere else on Earth. Even the ground underfoot is unique. A mere hundred thousand years ago, Key West was not only underwater, but alive. Its entire surface teemed with millions of tiny coral which slowly built the island's limestone bedrock over countless millennia.
Gibson, Abraham H.
"American Gibraltar: Key West during World War II,"
Florida Historical Quarterly: Vol. 90:
4, Article 3.
Available at: https://stars.library.ucf.edu/fhq/vol90/iss4/3