1. Man-Made
   1. Recreational Areas
   2. Public Facilities
   3. Monuments
   4. Buildings
   5. Factories and Industries
2. Human
   1. Political Situation
   2. Individual
   3. Family
   4. Community
   5. Religion
3. Natural
   1. Lithosphere
   2. Hydrosphere
   3. Atmosphere
   4. Biosphere