"There are about 40 abandoned or relocated stations on the Underground network along its entire 255 miles (408Km) of trackway - some subsurface and some above ground. Some have vanished without trace whereas others are almost intact, grimey time capsules of the era when they were closed."
Link to the Website here.
Link to Abandoned Stations in NYC here.
More urban exploration here.
Japanese urban exploration here. (photo set 4 is a dilapidated amusement park)