Mars0009_2 Mars0002_2 Mars0003_2 Mars0006_2 Mars0011_2 Mars0024_2 Mars0025_2 Mars0028_2 Mars0030_2 Mars0031_2 Mars0033_2 Mars0038_2

The Sound Mirrors are described at wikipedia as:

The acoustic mirrors, known colloquially as 'listening ears', at Denge are located between Greatstone-on-Sea and Lyddairfield, on the banks of a now disused gravel pit. The mirrors were built in the 1920s as an experimental early warning system for incoming aircraft, developed by Dr William Sansome Tucker. Several were built along the south and east coasts, but the complex at Denge is the best preserved.

This was our route.