There are 18 sites without co-ordinates:

England
• Bronze Age Trackways
  
  Ireland (Republic of)
• Cloghboola
  
• Durrus
  
  Wales
• Llandissilio Cursus
  
• Prisk 1
  
• Prisk 3
  
• Eglwyswrw
  
• Holyhead I
  
• Holyhead II
  
• Holyhead III
  
  United States
• Crowders Mountain stones
  
  Portugal
• Fonte Vida
  
  Germany
• Bursfelde Steinkreis
  
• Aukrug-Innien, Germany
  
  Bulgaria
• Perla Cromlech
  
• Perla Dolmen 2
  
  Bolivia
• Pokotia Monolith
  
  Hungary
• Pithenge (Szeged)