There are 225scheduled monuments in the county ofHertfordshire,England.^[1] Theseprotected sites date from the Neolithic period and includebarrows, ruined abbeys,castles, and Iron Agehill forts.^[2]In the United Kingdom, the scheduling of monuments was first initiated to ensure the preservation of "nationally important" archaeological sites or historic buildings. Protection is given to scheduled monuments under theAncient Monuments and Archaeological Areas Act 1979.^[3]

Image	Name	Location	Date	Notes
	St Albans Cathedral	51°45′02″N0°20′32″W / 51.750556°N 0.342222°W /51.750556; -0.342222	1077 AD	The cathedral is known for having the longestnave in England.[4]
	Old Gorhambury House	51°45′25″N0°23′36″W / 51.75694°N 0.39333°W /51.75694; -0.39333	Built 1563–1568	Ruined 16th century mansion. An excellent example of an Elizabethanprodigy house.[5]
	Rye House, Hertfordshire	51°46′16″N0°00′25″E / 51.7711°N 0.007°E /51.7711; 0.007	c 1443 AD	The gatehouse of a former fortifiedmanor house. The house was the setting of theRye House Plot.[6]
	Welwyn Roman Baths	51°49′40″N0°12′29″W / 51.8277°N 0.2081°W /51.8277; -0.2081	3rd century AD	Roman bath complex within the Dicket Mead Roman villa.[7]
	Verulamium	51°45′00″N0°21′14″W / 51.7500°N 0.3539°W /51.7500; -0.3539	1st century AD	The ruins of aRomano-British city. Most of the city has not been excavated.[8]
	Waytemore Castle	51°52′19″N0°09′47″E / 51.871934°N 0.162959°E /51.871934; 0.162959	late 11th century	The monument contains mostly earthenworks of what was originally aNormanmotte-and-baileycastle.[9]

• The Hundred Parishes
• List of scheduled monuments in the United Kingdom

• Scheduled monuments in Hertfordshire
• Lists of scheduled monuments in England

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