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- Aar River (Switzerland)1
- Abandoned buildings6
- Abbeys1
- Abies nordmanniana1
- Acacia7
- Acadia National Park (Me.)2
- Acanthopanax ricinifolius1
- Accidents1
- Accreted terrain1
- Acer campestre1
- Acer ginnala1
- Acer negundo1
- Acer palmatum atropurprea1
- Acer tataricum1
- Achillea1
- Acropolis (Athens, Greece)6
- Adler Planetarium & Astronomy Museum1
- Adobe buildings15
- Adobe houses8
- Aeonium1