UNITED NEWS INTERNATIONAL (UNI) — Record-high heat in the UK is bringing out more than just sunbathers.

It’s also pulling back the curtain on our ancient past.

The wave of intense heat has sparked a drought and turned parts of the countryside brown.

The resulting lack of green grass gives a clear view of the traces of typically-hidden archaeological sites known as “cropmarks.”

Images taken by the Royal Commission on the Ancient and Historical Monuments of Wales this month show the ghostly outlines of medieval castle mounds, long-buried ramparts, forgotten farms and Iron Age hillforts.

Dying grass has also revealed the vivid outline of an ornate garden in Lancashire. It was created in the mid-1800s but removed after World War II.

The heatwave that’s exposed these geological secrets is the longest to hit Britain in more than 40 years.