nature trail sign post in winter with long grasses and foggy background - nepese marsh - fermilab illinois

nature trail sign post winter long grasses nepese marsh fermilab illinois educational path walk specially developed hiking footpath runs countryside marked stations stops next points natural technological cultural interest convey information flora fauna soil science geology mining ecology history longer trails link spaced phenomena structures together referred themed paths purpose increase knowledge linked tourism recreation raising environmental awareness provide imaginative interactive ways experience occasionally guided tours available foggy background