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An exact replica of a 700-year-old castle is built from tens of thousands of Lego bricks in this amazing time-lapse video.

The model of Caernarfon Castle, built by retired doctor Bob Carney of Illinois from more than 70,000 bricks, is set to dominate the Brickworld Lego exhibition in Chicago this weekend.

Earlier this year, Mr Carney built a replica of Rhuddlan Castle using more than 60,000 bricks.

WATCH: Time-lapsed video of Rhuddlan Castle recreated with 50,000 Lego pieces

The video showing the construction of his Caernarfon Castle replica has been created with more than 6,000 individual images.

As the castle appears over the course of the three-minute video, viewers will see knights, rowers enjoying the Lego version of the Menai Strait, and even a Welsh dragon terrorising the castle’s tiny inhabitants.

Mr Carney, who took a two-week break from working on the castle in May to visit Wales and more than 20 of its historic sites, said: “Caernarfon has taken more than three months to build, including the time I took to visit the real site first-hand.

“Transporting the 70,000 bricks more than 700 miles to Chicago was a challenge in itself.

“I hope it’s inspired children and adults in Wales to explore their amazing heritage.”