Palace of Versailles
This luxurious 17th-century French castle is a masterclass in excess. It has hundreds of acres of magnificently landscaped gardens, more than 700 rooms, a large collection of 18th-century French art, an opera house, and a 75m long hall of mirrors lined with statues and busts. There are no half-measures in its conception or execution (for example: it has more than 1,200 fireplaces!).
It's one of the most visited attractions – and castles – in France, as well as a UNESCO World Heritage Site.