tree top trail watchtower, stezka korunami stromu, janske lazne town

wooden path bridge fence environment krkonose mountains great playground family trip fun attraction hiking hike tourism ladder construction forest lookout tower toboggan janske lazne treetops spiral staircase steel view circular czech bottom watchtower treetop ascending observation metal steps post point sky travel design architecture building support stage tree top trail stezka korunami stromu town czechia watch metres high