Wired has a photographic gallery of the world’s ‘most impressive’ subways. NYC makes the list for scale and 24/7 availability.

Out of the list, I have ridden the NYC, Paris Metro, and London Underground. The Paris Metro is my favorite, because every time you step out of the subway onto the street, all you can think is “Holy Crap I’m in PARIS!”

One of my favorite trains is the London Heathrow Express, which isn’t technically part of the underground. Its a sleek train with a soothing interior which travels nonstop from Paddington Station to Heathrow in record time. Getting from downtown London to Heathrow is about 100x easier and faster than getting through Heathrow to your gate.

My favorite part of the Heathrow Express is that they have these little video screens - I don’t remember what they show, some Heathrow information maybe and some ads - but the audio and volume of the content is specifically very low-key and unobtrusive. Thoughtful.