The Elie Chainwalk in Scotland is a unique coastal trail that lets adventurous hikers explore the base of towering cliffs using chunky chains and carved footholds. Dating back to 1929, this trail offers a thrilling seaside adventure with basalt columns, tidal pools, and even World War II pill boxes to discover. Just make sure to check the tide before setting out, as you wouldn't want to get stuck on the cliffs when the water comes in!