threshold population- minimum amount of people required for a facility to be viable. Sphere of influence from how far a person will come from around the world to visit an attraction, or an activity, and the range is the maximum distance, the limit of the sphere.

factors affecting participation. The income as well as working hours. Fuel use and eco-friendliness. A pandemic or flu season. Natural disasters.

Venice is an urban hotspot, with physical factors such as rivers and water surrounding everything. Climate is perfect but gets quite hot during summer. Human factors, architecture is beautiful as well as historic. Few festivals during the year and the boats / gandu take people around the city.