They say an ancient castle once stood on the site of the Red Mount Chapel.

Eastern Daily Press: The Upper Chapel on the second floor of The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Upper Chapel on the second floor of The Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

The octagonal structure has towered over what is now The Walks, in the heart of King's Lynn, for more than 500 years.

Eastern Daily Press: Graffiti inside The Red Mount Chapel in King's Lynn dates back to the 17th century. Picture: Ian BurtGraffiti inside The Red Mount Chapel in King's Lynn dates back to the 17th century. Picture: Ian Burt (Image: Archant 2017)

Red Mount was originally built as a chapel of rest for pilgrims on their way to the shrine 25 miles away at Walsingham, to raise money for St Margaret's Church (now Lynn Minster).

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

It has also been used as a gunpowder store, water tower and observatory.

Eastern Daily Press: A recessed brick handrail inside The Red Mount Chapel in King's Lynn. Picture: Ian BurtA recessed brick handrail inside The Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

The chapel has had some lucky escapes in its time, surviving both the Reformation and Civil War, along with a German air raid on Lynn in 1942, when bombs narrowly missed it.

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

In 2007, the derelict Red Mount was restored with the help of a £4m lottery grant.

Eastern Daily Press: Graffiti inside The Red Mount Chapel in King's Lynn dates back to the 17th century. Picture: Ian BurtGraffiti inside The Red Mount Chapel in King's Lynn dates back to the 17th century. Picture: Ian Burt (Image: Archant 2017)

Visitors to the chapel can explore the lower chapel, priest room and upper chapel, where they will find a magnificent fan-vaulted ceiling as well as graffiti dating back to 1639.

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Red Mount is open May to mid-September on Wednesdays, Saturdays and Sundays from 1.00pm - 4.00pm.

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Upper Chapel on the second floor of The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Upper Chapel on the second floor of The Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Upper Chapel on the second floor of The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Upper Chapel on the second floor of The Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Upper Chapel on the second floor of The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Upper Chapel on the second floor of The Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Priest's Room inside The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Priest's Room inside The Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Upper Chapel on the second floor of The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Upper Chapel on the second floor of The Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)

Eastern Daily Press: The Red Mount Chapel in King's Lynn. Picture: Ian BurtThe Red Mount Chapel in King's Lynn. Picture: Ian Burt (Image: Archant 2017)