Buck Island is a privately owned island of the British Virgin Islands in the Caribbean. Buck Island was purchased and developed by Carl & Sharon Nilsen from 1998-2008. The couple spent 10 years building the roads and multi-structure buildings that resemble a castle made from the natural stones on the property. Hurricane Irma and Maria hit the British Virgiā¦Buck Island is a privately owned island of the British Virgin Islands in the Caribbean. Buck Island was purchased and developed by Carl & Sharon Nilsen from 1998-2008. The couple spent 10 years building the roads and multi-structure buildings that resemble a castle made from the natural stones on the property. Hurricane Irma and Maria hit the British Virgin Islands in 2017 causing considerable damage to the territory.