Prague Castle opens at 6 AM for grounds access before ticket areas open at 9 AM. Those three hours of free access to the courtyards and exteriors are remarkable - you're walking through what archaeologists believe has been continuously occupied for over 6000 years.

The Gothic cathedral, baroque palace additions, and medieval fortifications tell the complete story of Central European power from Holy Roman Empire through Habsburg rule to modern Czech Republic. Most visitors rush through in 90 minutes but this deserves half a day.

Security guards are surprisingly knowledgeable about architectural details if you engage respectfully. The view from the castle grounds at sunrise rivals any paid observation deck in the city.