Not to be confused with the more famous and high Feldberg in Black Forest, the highest peak is the Großer Feldberg (878 m above sea level). It is followed by the Kleiner Feldberg and the Altkönig (798 m) with the remains of a late Iron Agehill fort (La-Tène A, ca. 400 BC) near the summit.
The RomanLimes was built across the Taunus. The Saalburg, a restored Roman castellum, now houses a museum. After the fall of the Limes (in 259/260 AD), the Alamanni settled here.