Photo of London Metropolitan construction courtesy London Transport Museum
On this day in 1863, the world's first passenger underground railway opened in London, called the London Metropolitan. Click here to see pictures and photos, and for more historical information.
I've been on many underground railways around the world. The ones I probably like the best are the NYC subways, San Francisco's BART, and the Paris Metro. To me, by far the prettiest is the Paris Metro. What is your favorite subway system?
