Inside a bottle kiln, Coalport China Museum, Shropshire.

The bottle kilns at Coalport China Museum, near Ironbridge, Shropshire.

Inside a bottle kiln at Coalport China Museum, near Ironbridge, Shropshire.

A bottle kiln at Coalport China Museum, near Ironbridge, Shropshire.

Saggers stacked in a bottle kiln at Coalport China Museum, near Ironbridge, Shropshire.

A bottle kiln at Coalport China Museum, near Ironbridge, Shropshire.

The Coalport China Museum, one of the Ironbridge Gorge Museums, reflected in the water of the Shropshire Canal at Coalport, Shropshire.

A bottle kiln at Coalport China Museum, one of the Ironbridge Gorge Museums, at Coalport, Shropshire.

Coalport China Museum reflected in the waters of the Shropshire Canal, near Ironbridge, Shropshire.

Coalport China Museum reflected in the waters of the Shropshire Canal, near Ironbridge, Shropshire.

A bottle kiln at Coalport China Museum reflected in the water of the Shropshire Canal at Coalport, near Ironbridge, Shropshire.

Coalport China Museum and bottle kiln at Coalport, near Ironbridge, Shropshire.

Snow-covered bottle kiln at the Coalport China Museum, one of the Ironbridge Gorge Museums, at Coalport, Shropshire.

The Tar Tunnel, one of the Ironbridge Gorge Museums, at Coalport, Shropshire, England.

The entrance to the Tar Tunnel, one of the Ironbridge Gorge Museums, at Coalport, Shropshire.

The Tar Tunnel, one of the Ironbridge Gorge Museums, at Coalport, Shropshire.

A view of Coalport China Museum, one of the Ironbridge Gorge Museums, at Coalport, Shropshire.

Coalport China Museum, one of the Ironbridge Gorge Museums, on the banks of the Shropshire Canal at Coalport, Shropshire.

A kiln alongside Coalport China Museum, one of the Ironbridge Gorge Museums, at Coalport, Shropshire.

Snow covered bottle kiln at the Coalport China Museum, one of the Ironbridge Gorge Museums, at Coalport, Shropshire.