St. Thomas was founded by Mormons back in the 1800s, but by the time the 1920s rolled around, the US government had begun to buy land off of local farmers and residents in anticipation of a developing situation: the Hoover Dam was being built nearby. By the late 1930s, what was once St. Thomas would be sleeping with the fishes in Lake Mead. And so it did until a drought hit just last year, and the ghost town became a land lover's reality once again. For the next few years, the curious can go check out the foundations, car parts, stairways, and artifacts left behind, before the lake eventually fills back up.
Port Royal was known as the world’s "wickedest city" for a reason -- while European explorers were first checking out the Caribbean, the city at the mouth of Kingston Harbour became a one-stop shop for prostitution, booze, and pirates. Yup, real-life pirates were thoroughly enjoying themselves in Port Royal up until one fated day in 1692, when part of the town was suddenly submerged during a severe earthquake and tsunami. Now, several hundred sunken ships, paved streets, and fallen buildings sit below 40ft of water off of the city's coast.