Figure 1. Simple stone footbridge a) stepping stones (Sourced from https://endellionbarge.files.wordpress.com/2014/05/tarr-steps-clapper-bridge.jpg; photo by Charlesdrakew) b) Tarr Steps (Sourced from http://www.bristol.ac.uk/civilengineering/bridges/Pages/ NotableBridges/TarrSteps.html; photo by David Blockley) footbridge

From

The World’s Oldest Bridges - Mycenaean Bridges

Karas Slawomir, Nien-Tsu Tuan

American Journal of Civil Engineering and Architecture. 2017, 5(6), 237-244 doi:10.12691/ajcea-5-6-3