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- Aar River (Switzerland)1
- Abandoned buildings8
- Abbeys1
- Abies nordmanniana1
- Acacia7
- Acadia National Park (Me.)2
- Acanthopanax ricinifolius2
- Accidents2
- Accreted terrain1
- Acer campestre1
- Acer ginnala2
- Acer negundo2
- Acer palmatum atropurprea2
- Acer tataricum1
- Achillea3
- Aconthopanax ricinifolium1
- Acropolis (Athens, Greece)10
- Adler Planetarium & Astronomy Museum1
- Adobe buildings26
- Adobe houses11