One of the easiest ways to get second residency which can eventually lead to actual citizenship is investing in real estate.
Depending on your needs, final goals and financial situation, you can choose from a variety of different countries that have easy second residency procedures.
Some of them, like Serbia, Montenegro or Turkey, don't have special requirements regarding properties. Also, there are countries like Georgia and Thailand with pretty straightforward programs.
Finally, some of the Latin American countries, such as Nicaragua, Panama or Colombia offer excellent real estate investment programs, that can easily lead to permanent residency or even citizenship.