Hôtel de Castries - Credit: Wikimedia Commons
The Hôtel de Castries is an hôtel particulier in the 7th arrondissement of Paris, at 72 Rue de Varenne. Dating from the end of the 17th and beginning of the 18th century, it was profoundly transformed by the Duke of Castries between 1843 and 1863, under the architects Joseph-Antoine Froelicher and François Clément Joseph Parent. Read more on Wikipedia
Source: en.wikipedia.org