The maars of Daun
Probably the most famous 'eyes' in the Eifel: the three volcanic lakes by Daun. The maars of Schalkenmehren, Gemünden and Weinfeld (the latter also known as Totenmaar, or Maar of the Dead) lie in a row like pearls on a string.
They are linked by amazing hiking trails, and Dronketurm Tower on the Mäuseberg hills between the maars of Gemünden and Weinfeld provides a breathtaking view over the three deep-blue pools. On a clear day you can even see the outline of the Hunsrück peaks from here.
The births of the three maars are closely linked: they are believed to have formed one after the other within a relatively short geological period 15,000 to 30,000 years ago from a dyke running from the southeast to the northwest. At the time, the Ice Age landscape around Daun was shaken by numerous explosions, but volcanic lakes only formed and remained in three craters. This is due to the layers of slate, sandstone and mudstone (highly impermeable rock) jutting out of them.