Yes, you must purchase a ticket to enter the National Palace of Pena in Sintra, Portugal, and since 2024, the system has become quite rigid to manage overcrowding. There are two main types of tickets: a "Park" ticket and a "Palace + Park" ticket. The Park-only ticket allows you to wander the 200 hectares of forest, gardens, and the exterior terraces where you can see the famous colorful facades of the castle. However, if you want to see the royal dining rooms, bedrooms, and private quarters, you must have a Palace ticket, which requires a specific date and time slot. These slots sell out weeks in advance during the peak summer season, so booking online ahead of time is essential. If you arrive late for your designated 30-minute entry window, you will likely be denied entry to the interior. As of 2026, many visitors opt for the Park ticket alone to avoid the interior crowds while still capturing the iconic photos of the vibrant yellow and red towers from the outer battlements.