This tunnel, once used by t he Fredericksburg & Northern Railway, is today a habitat for Mexican bats, which attract many visitors at dusk. The site near Fredericksburg has been designated a historic location by the Texas Historical Commission. Shot with an Olympus 4/3 format E-420 and an Olympus 14-42 zoom lens. Raw development in DxO Optics Pro 9 via Lightroom 5.3. Post processing in Viveza 2, Topaz photoFXlab, Topaz Adjust 5 amd PhotoLine 18.