Elin's Tower (Welsh: Tŵr Elin) is a Victorian stone tower on Holy Island, located around 2+1⁄2 miles (4 km) west of Holyhead.
The castellated folly, which was originally used as a summer house, was built between 1820 and 1850 for the notable Stanley family from Penrhos.
[1] It is named after Elin (anglicised as "Ellen"), the Welsh wife of the 19th-century politician William Owen Stanley.
[2] The building near South Stack was used during both the First and Second World Wars as a coastal observation tower.
The restored tower is used as an RSPB information centre, shop and café for the nature reserve in which it is situated, and affords a good view of South Stack and its lighthouse.