Palazzo Ducale, Venice

The Doge’s Palace is the undisputed masterpiece of Venetian Gothic architecture, drawing 2.3 million visitors annually—more than any other museum on this list except the Uffizi. The palace’s Golden Staircase, with 24-karat gold leaf on stucco, exemplifies a level of opulence that cost 1,200 ducats in the 16th century—roughly €1.8 million today. Compared to the urban clutter of Naples’ Capodimonte park, the palace’s direct lagoon-front setting offers an immersive historical context, while its 36-room itinerary requires 20% less walking than the sprawling 47-room layout of its rival. At €26 ticket price, it undercuts the €32 full-price entry at Milan’s Pinacoteca di Brera, delivering superior density of canonical masterpieces per euro.