'Tis a huge genus and there are plenty of tender ones, especially from Mexico, so yes, some can be grow inside.

But the hardy ones will be unhappy if you try to grow them as house plants.

If by inside you mean in your house? Then yes, just about all plants can be grown inside given the right conditions that they are accustomed to in their natural habitat like light, humidity, etc, but the best place for plants is always outside if it's possible. Do you have a specific reason why you want to grow them indoors? What is your USDA Hardy Zone?