Halki — also spelled Chalkio — was the capital of Naxos for much of the Venetian period and retains the slightly formal air of a place that was once important. It sits in the Tragea valley at the heart of the island, surrounded by ancient olive groves that are among the oldest in the Cyclades. The village is small (a few hundred permanent residents) but packed with architectural detail: Byzantine churches with frescoed interiors, the towers and carved doorways of Venetian merchant families, and lanes that wind in the gentle confusion of a place built over many centuries.
The church of Panagia Protothroni in the village centre has frescoes dating from the 9th to the 13th century — several distinct layers, as successive generations painted over and around their predecessors. The quality is uneven but the cumulative effect, walking through a space that was continuously embellished for four hundred years, is remarkable. The church is usually unlocked in the mornings; ask at the village if it's closed.
Several Venetian pyrgoi are visible from the main square, their stone coats of arms still reading legibly above the doorways. The tower of the Grazia-Barozzi family is the best preserved and occasionally opens for visits. Beyond the towers, the village has a few small cafés, a bakery, and the Vallindras Distillery — the family operation that has been producing Naxos's distinctive citron liqueur for generations. The distillery sits on the edge of the village, identifiable by the citron trees planted outside, and offers free tastings daily in summer.
Halki makes an excellent base for exploring the central Naxos interior. The road connections to Apiranthos to the east, Filoti to the south, and the Temple of Demeter at Sangri are all within easy driving distance, and the village itself rewards an unhurried hour or two.