There are many stations on the network that have either been in use, and are no longer at all, some have been demolished and rebuilt and some have been repurposed and some have just been left abandoned.
There are also some stations that are still in use which have been redeveloped over the years, and now have disused platforms and tunnels.
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Some stations have been relocated to a slightly different location/position, to allow for more passenger capacity and for roads to be built. Quite often if you know what you are looking for, you can see evidence of where tracks and platforms have been previously.
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There is a list full list of abandoned/disused stations and platforms can be found here.
Some of the abandoned stations that have buildings left are also now listed buildings.
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The London Transport Museum does offer tours of some of them, which can be booked through their website and they have produced a series of YouTube videos which have been listed on the YouTube section of this website here.
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There is a full list linked to this website here