UP to €20,000 is believed to have been taken in a robbery from the Cliffs of Moher visitor centre between 10pm on Sunday night and 9am on Monday morning.
It is believed that power cables were cut to the centre which rendered the security system obsolete.
The centre was closed for a period on Monday to allow ESB Networks to restore power to the centre. The Cliffs of Moher is the second most visited tourism attraction in Ireland.
Gardai in Ennistymon are investigating and are appealing for information from anybody who witnessed suspicious activity in the area on Sunday night or Monday morning.