Sites of historical interest include two Iron Age hillforts; Castell Cawr at Tan y Gopa and Dinorben (now virtually disappeared owing to limestone quarrying) at St. George. On Gallt y Felin Wynt, a hill above the town popularly known as Tower Hill or Bryn Tŵr, is a 17th-century watchtower, partially restored in 1930. There is another Iron Age fort at Pen y Corddyn Mawr hill above Rhyd y Foel. There is also another watchtower, Lady Emily's Tower, which is located near Cefn yr Ogof.