Author: Sarah Sekula, Special to USA TODAY

Dry Tortugas, about 70 nautical miles west of Key West in Florida, is one of the least-visited national parks. But that’s exactly its appeal.

From Gothic-inspired relics to shiny modern-day buildings, these iconic campus structures are worthy of adding to your next road trip.

Divers from around the world head to Tiger Beach in the Bahamas to swim with tiger sharks, reef sharks, lemon sharks and more.