Brant Point Light

Maggie and Karen will be married at the Brant Point Light, which is located about a half mile from the center of Town. 

The second oldest lighthouse in the United States, the Brant Point Light stands at the mouth of Nantucket Harbor. Be sure to toss a penny toward the lighthouse as you pass Brant Point leaving the island -- it's a legend that this ensures your return. Maggie has been doing this since she was 4 years old and it's still working!
http://www.lighthouse.cc/brant/history.html