The three great baroque set-pieces of central Rome are all completely free, and all worth visiting at different times of day.
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Trevi Fountain is a must-see in Rome where visitors traditionally toss a coin into the water for good luck. It is free to view at all times, though access to the lower basin area may carry a small fee during certain hours. The best time to visit the Trevi Fountain is early morning, before 8am the crowds are minimal and the light on the stone is beautiful. At night, the fountain is illuminated and the atmosphere shifts entirely; both versions are worth experiencing.
The Spanish Steps, 135 steps connecting Piazza di Spagna to the Trinità dei Monti church above, are free to climb and one of Rome's best spots for people watching. The steps fill with locals and tourists alike through the afternoon and evening; arrive at sunrise and you'll sometimes have them almost to yourself. Sightseeing in this part of the city rewards early mornings.
Piazza Navona was once a hub for local life and markets, and today it remains a vibrant square filled with artists, performers, and the kind of street-level energy that reflects the spirit of Rome. Bernini's Fountain of the Four Rivers, the four rivers fountain at the center of the square, is one of his masterpieces, and you can stand directly in front of it at no cost. Sit at the edge of a fountain, watch the scene, and spend as long as you like.