If you’ve been to Stockholm, Sweden you’ve probably seen their amazing subway stations. They are a very popular tourist attraction and it can by quite busy during the day. If you go off-peak hours many of them are virtually empty. Be warned, tripods are not allowed for photography so you’ll need to be creative.
I used a mini-tripod set up on an ancient stone wall to get this long-exposure shot of La Baia del Silenzio (The Bay of Silence) at sunset.