Astronauts during the Apollo era snapped photos of the Earth as they left Earth and on their way back.
The International Polar Year collection during Increments 14-18 provides excellent imagery of glaciers, icebergs, and other features from space.
Darwin HMS Beagle
Many of Darwin's stops in the HMS Beagle are photographed from space.
Transit of Venus
The Transit of Venus (2012) was photographed from the ISS. The next TOV will occur in the year 2117.
The NightPod device on the ISS allows the crew to take clear, crisp images of cities at night.