... are basically high resolution panoramas, but what exactly is a gigapixel? Here is a comparison to show the size:

Maastricht - dock

1.164 gigapixel

One gigapixel is equivalent to a thousand megapixels or one billion pixels. (1,000,000,000px)

If this were ten megapixels (a common resolution of "better" digital cameras)

this would be one gigapixel (one hundred times as many pixels)

one dollar bill - front

254 megapixel

one dollar bill - back

690 megapixel

Frankfurt - Main Tower

660 megapixel

Maastricht - Sint Jan church

3.0 gigapixel

To zoom in click anywhere in the image, scroll using the mouse wheel or use the buttons. To pan click and drag or use the buttons again.

To view the panoramas the latest version of the Adobe Flash Player should be installed and the fullscreen-mode should be activated (button in the lower right hand corner of the viewer).

New York - East River