Altamira

3 clues
Underground art site in Spain
Cave famously visited by Picasso
Cave in Spain famed for its prehistoric paintings
Similar answers:
Actuarialtables
Additionaltaxes
Admirable
Admirablein
Admirably
Admiral
Admiralbenbowinn
Admiralbyrd
Admiralcrichton
Admiralfarragut
Admiralnelson
Admiraloftheoceansea
Admiralrange
Admiralrickover
Admirals
Admiralsnackbar
Admiralties
Admiralty
Admiraltyarch
Admiralwasalady