Always Free: National Gallery Ireland (Mon-Sat 9:15-17:30, Sun 11-17:30) - Caravaggio plus solid Irish collection. National Museum Archaeology (Tue-Sat 10-17, Sun-Mon 13-17) - Viking artifacts, medieval gold. Hugh Lane Gallery (check current hours) - Francis Bacon's studio reconstructed.

Irish Museum Modern Art and Science Gallery Trinity - check individual exhibition details for current access and pricing.

National museums offer free admission. Add free walking tours = full cultural day spending nothing beyond transport. Always verify hours before visiting because nothing worse than showing up to closed museums.