[wklauss]

Around man-made structures you'll not appreciate it because the trend is the opposite, we usually gain land to the sea with construction. Shoreline of San Francisco in 1900 probably reached far beyond the actual point in the developed areas.

Water lines are not necessarily indicative and we didn't have satellite pictures or detailed measurements 100 years ago but you can definitely see the sea rise affecting some areas in the world, like islands in the Pacific Ocean or the extensions of salt water marshes. In satellite pictures is posible to appreciate the change the shape of the shores in some points of the globe, if you have a good resolution capture, comparing pictures of just a decade ago.

Here's the kicker. You don't even need to see pictures. We have constant detailed measurements of sea levels (better than water lines) taken all around the planet going back to several decades.

If you want to check them, NASA has a great page for it. http://climate.nasa.gov/vital-signs/sea-level/ (and yes, they have pictures too).

And if you think NASA is somehow biased, you can check pretty much any other environmental agency or space agency in the world.