A modular and portable shelter is disclosed. The shelter includes a base designed to sit on a surface, such as the ground. The shelter also includes support poles, with each support pole including a first end that releasably couples to the base and a second end. Additionally, the shelter includes a hub defining a openings along an outer perimeter thereof, with each opening being angled downwardly and slidably receiving a respective second end of a respective support pole. Further disclosed is a shelter system which includes portable shelters positioned adjacently and coupled via connecting rods. The connecting rods detachably connect between the hubs of the adjacent portable shelters to form a larger overall structure.