The tropical environs of this place already make it worthy, but the access to health care, cost of living (tied with Colombia and Thailand) on the Global Retirement Index with $1,700 a month (for a retired American couple) and colonial charm make the capital of the state of Yucatan, a place to set up home. Sitting 22 miles inland, Merida has a European feel, thanks to its Old World architecture and abundant culture. There are opera houses and cathedrals to explore, and foodies rave about the dining scene. There's a growing population of retirees from the U.S., as evidenced by an English-language newspaper and library. Merida has also escaped the violence that has plagued Mexico's border towns.