You're likely thinking of the Forbidden City in Beijing, China. This massive palace complex, built during the Ming Dynasty, is renowned for its three-tiered structures, often adorned with red walls and gold detailing.

Here's why this fits your description:

* Three-Tiered Structures: The Forbidden City is full of buildings with three tiers, often with a central pavilion surrounded by smaller structures. This design reflects the hierarchical structure of Ming society.

* Red Walls: The walls of the Forbidden City are indeed red, a color symbolizing prosperity and good luck in Chinese culture.

* Gold Detailing: While the walls themselves are red, many architectural elements like roof tiles, pillars, and decorative carvings are often gilded with gold, adding to the grandeur and opulence of the buildings.

Important Note: While the Forbidden City is the most famous example, other Ming Dynasty buildings throughout China may also feature these architectural elements. The three-tiered structure, red walls, and gold detailing were common design features of important government buildings and temples during that era.