Founded in 1976, the Serifos Folklore Museum is run by the Serifos Association and housed in a building of noteworthy architecture in Kato Hora. Its collection features documents and artifacts - tapestries, ceramics, household furnishings, porcelain - and traditional costumes. The museum also has space for hosting events, including a 300-seat open theater where a range of cultural events organized by the Serifos Association are held in summer. The theater was built in 1996 to mark the association's centenary.
Sunsets at Kastro are ample reward for the trek up.
The island's Archaeological Museum has a small but interesting collection.
Kastromonastiro Taxiarhon, a fortified monastery founded in 1572 noted for its high perimeter walls and battlements and low loggia entrance, is located on the island's northeast.
The Triple-Conch Domed Church has a pretty iconostasis and a number of wall paintings; the floor is laid with a marble plaque decorated with a two-headed eagle and dated to 1659.
Also known as the Cyclops's throne, the White Tower (Aspros Pyrgos), and Tis Grias to Kastro, the Koutalas or Stavrakopoulos cave boasts wonderful stalactites and stalagmites and crystallized ceramics. It's noted for the rack and rail system built on the stone tracks to carry ores from the Skales mines.
The elegant Neoclassical Governors' Mansion at Mega Livadi formerly housed the residence, offices, and other facilities of the Grohmann family, European businessmen who held the exploitation rights to the mines through the interwar period.
The Iroo, a marble monument to the 1916 miners' uprising.
The Thermal Baths and private display of soil samples at the old school.
The underground passage to Koutalas, part of the Grohmanns' heritage to the island; exploring the passage is not recommended without the aid of an experienced local guide.
Skala, the mine's loading area.