To enlarge photos, click on the thumbnail - the photo will pop up enlarged to 1024 pixels max (height or width). To view at Original size (best for maps, etc.), Ctrl-Click on the Photo, and finally a 3rd click to enlarge to the original resolution. Click again to reduce back to fit the screen again.

If you want to save photos to your computer, click the box under the thumbnails of all the photos you want to download (or check the "select all" box at the bottom of the album). Then click the "Download" button at the top of the album. Pick the size you'd like to download (Original is best)and the photos will be downloaded as a zip file to the folder of your choice.