The public are being given a rare opportunity to visit an archaeological dig on the North York Moors.
The Landscape Research Centre is trying to learn more about a rare Iron Age hill fort at Boltby Scar near Sutton Bank.
The scheduled monument, one of only a handful of forts found in eastern Yorkshire, was extensively damaged after being bulldozed in 1961.
Free tours are being offered on Sunday 29 May and Bank Holiday Monday 30 May.
Archaeologists believe this area of Yorkshire was an important site for Iron Age man.
Boltby Scar had defensive earthworks and there is another hill fort sited nearby at Roulston Scar.
The site has been excavated on at least two previous occasions but little information from those digs survive.
For more interesting topics related to archaeology, visit archaeology excavations.