Active VPCs, subnets and security groups in aws regions I don't use

Looking at the Resource summary page for EC2, I just find out that I have VPCs, subnets and security groups active in various AWS regions. I honestly don't remember how I created them so I wonder if they gets created automatically in some way?

Do I need them? I only have EC2 instances in us-east-1.

Am I going to be charged for them? If so, how can I do some clean-up?

Thanks