Faller is a German company specializing in making scenery and plastic model kits for model railways and railroads.
Their product line contains trees, bridges, houses, terrain accessories and amusement rides in H0, N, TT and Z scales. Faller also owns the Pola brand, which is now solely devoted to G gauge structures.
What's it worth? Take a look at this Faller price guide: sold listings for a value indication.