Vocabulary

 

a cromlech

a mysterious rock structure

 a riddle/ an enigma                                                                                                sovereignty

 a conundrum                                                                                                           regalia

a brain-teaser                                                                                                           symbols/ tokens

a mind-twister                                                                                                         monarchy

a sixty-four dollar question                                                                                   national pride

a tough nut to crack                                                                                               coronation                                                               

rulers

                                                                                                                                    display/ exhibition

 

Old stones ?

                                                                                                                                 

intriguing  / puzzling                                                                                 emblematic                                      

mysterious                                                                                                  meaningful/ significant

unknown                                                                                                     representative      

peculiar                                                                                                       prestigious      

odd/ strange/ weird                                                                                  valuable/ worthwhile           

fascinating

mind-boggling