London
London Underground is probably the most famous underground system in the world, not surprisingly though, as it is the oldest underground, opened on 10 January 1863. At the time of its opening, it had only seven stations - Paddington (Bishop's Road), Edgware Road, Baker Street, Portland Road (now Great Portland Street), Gower Street (now Euston Square), King's Cross (now King's Cross St Pancras), Farringdon Street (now Farringdon). Now after more than 160 years of service there are 272 stations, making it one of the largest in the world.
The Underground, or the Tube, is not ideal, in fact it has a lot of flaws but it still remains one of the greatest networks existing. Personally, I am captivated by it - isn't it amazing to stand on the platform at the Baker Street station and imagine how 160 years ago people gathered on the same platform to ride the underground train for the first time in history?!
My personal goal is to visit all the stations in the network. As I don't live in London, or even in the UK for that matter, it will take quite some time for me. But one day I will do it! But as I am slowly moving towards my goal, I will be posting information about the stations I visit and some pictures I took during the visits.
For easier navigation, below will be a list of all the lines and stations of the network. The stations that I visited already are clickable.

List of London Underground lines
Bakerloo
Central
Circle
District
Hammersmith & City
Jubilee
Metropolitan
Northern
Victoria
Waterloo & City