In other countries, rules about title and ownership are not as clear as they are in the United States. For example, in Mexico, you can buy the house but only lease the land. The government owns the land. And the government can take it back at any time.
In many countries, you run the risk of your property being ransacked or nationalized. Think of most of the world as a place where there is no 911.
At the very least, if you want to buy overseas, read the State Department's report on the country. It's an authoritative guide that will help you assess whether the risk is worth the money.