On a budget, weigh it — Spanish Steps isn't cheap for what it is.
Free
Pretty, free, and genuinely over in five minutes — a wide travertine cascade that rewards exactly two kinds of visitor and disappoints everyone else. Come at dawn with a camera, or in the few April weeks the azaleas line the steps, and it's lovely; arrive midday expecting to linger and you'll find a no-sitting, no-eating, fined staircase you photograph and leave.