• 跡あと — trace; mark; remains
• 足跡あしあと — footprint; track; trace
• 足跡そくせき — one’s record; achievements
• 史跡しせき — historic site
• 遺跡いせき — (archaeological) ruins; remains
• 奇跡きせき — miracle.

The left-side radical あしへん（足） signals a foot/step. Add the sound element for セキ, and the whole character paints the idea of footsteps left behind — the marks, traces, or ruins that remain after something has passed.