Boyd's Tower is situated on the southern headland of Twofold Bay, Eden, NSW. It was built under the instruction of Benjamin Boyd, a London stockbroker with ambitious commercial plans for this area of the south coast of New South Wales.

The tower was built between 1846 and 1848 and was intended to be a lighthouse. It rises some 23 metres above the headland and is made of sandstone. Each block of stone was pre-cut, numbered and sent by sea from Sydney to be assembled on site. Twenty metres tall, the tower is surrounded by the sea on three sides. Here is the view south.

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The tower failed to satisfy an official inspection and was never completed. It was only ever lit three times. Instead, it came to be used as a convenient lookout for whales.

During season, the tower was manned daily and when a whale was observed, boat crews were alerted with a gunshot.