Set above the Somme River near Abbeville (1h40 from Paris), this 18th-century pink-brick residence is positioned atop a series of terraces with century-old greenhouses—each nearly 100 metres (328 feet) long—among the largest in private ownership in France.

For £5.5 million, you can buy 1,110 acres of Scottish wilderness—and a castle to restore, built by an Antarctic explorer whose architect sank with the Titanic.