Oranier Monument (Orange Tree) on the Oranienbaum Market Square

This eternal orange tree is probably the highlight of the place.

Oranienbaum Castle is one of four castles in Germany named after the House of Orange. They were built for four sisters, daughters of the Dutch governor Friedrich Heinrich Prince of Orange-Nassau and his wife Amalie zu Solms-Braunfels, who had been married to German rulers. In addition to Oranienbaum, these are Oranienburg Palace near Berlin (for Luise Henriette von Brandenburg), Oranienstein Palace near Diez (for Albertine Agnes von Nassau-Dietz) and the - no longer existing - Oranienhof Palace near Bad Kreuznach (for Marie von Pfalz-Simmern).
Wikipedia

The symbol of the city of Oranienbaum, the wrought-iron orange tree. It is in the center of the market square.