Walls of Jericho
The walls of Jericho were a military fortification surrounding the ancient Earth settlement of Jericho.

They were famous for having fallen despite being formidable. In 2368, Kamala compared Jean-Luc Picard's resolve to the walls of Jericho, in an attempt to convince him to see her again. ()

External link
 
 
 The story of Jericho in the Bible
Earth structures