28.  Culebra, Puerto Rico

Roughly 20 miles off Fajardo’s coast, Culebra is an underrated gem in a US territory. It features clear, tropical water, diamond-dust sand, and an exceptional abundance of wildlife. UNtil 1975, it was a US Naval base. (Notice the abandoned tank on favored Flamenco Beach.) Culebra is surrounded by over 20 cays so it’s the perfect place for scuba diving and snorkeling.

29.  Vieques, Puerto Rico

Another US territory, Vieques is a sparkling spot located six miles off the east coast of Puerto Rico. Yes, it features lush tropical flora, Instagramable beaches, and semi-wild horses. Its most famous attraction, however, is Mosquito Bay. Organisms called “dinos” make it the world’s brightest bioluminescent bay. Animal lovers will also want to see the Vieques National Wildlife Refuge.