Built 1911–13, this secessionist-style building is unlike anything you’ll find around Transylvania. Inside its glittering, tiled, steepled roofs are ornate hallways, colourful walls, giant mirrors imported from Venice, and an often-used concert hall (with a dramatic 4463-pipe organ), not to mention several worthwhile museums (all included in the entry price).
The most enchanting is the Hall of Mirrors (Sala Oglinzi), with 12 stained-glass windows lining a 45m hallway; each depicts a Székely fairy tale – check out the creepy devil ravishing the country maiden. The Art Museum (1st floor) houses many large late-19th-century and early-20th-century paintings; the Archaeological Museum (2nd floor) explains Dacian pieces found in the region (English signage).