What's the difference between dolmen and menhir?

Dolmen

Definition:

• (n.) A cromlech. See Cromlech.

Example Sentences:

• (1) According to Dolmen Securities in Dublin, there are signs that much of the demand was "internationally based."
• (2) The region is also famous for its prehistoric artwork and dolmen burial sites.

Menhir

Definition:

• (n.) A large stone set upright in olden times as a memorial or monument. Many, of unknown date, are found in Brittany and throughout Northern Europe.

Example Sentences:

• (1) The days when Asterix could be mined for sly political in-jokes, and a thinly disguised Jacques Chirac flitted between Obelix's menhirs, are past.