Alberobello's trulli district holds 1,400 conical limestone dwellings, their mortar-free construction a defense against 17th-century taxation laws that required homeowners to pay levies on permanent structures. Farmers built dry-stone walls they could dismantle when tax collectors arrived, then reassemble once officials departed. The technique, refined over three centuries, earned UNESCO World Heritage status in 1996. Matera's Sassi caves, 90 kilometers south, predate Alberobello by millennia: carbon dating places continuous habitation in these limestone ravines at 9,000 years, making them among Europe's oldest continuously inhabited settlements. The two towns anchor opposite ends of southern Italy's karst plateau, their architecture shaped by identical geology but separated by 900 years of settlement history. Alberobello rose as an agricultural village under feudal rule in the 1500s, its trulli clustered into the Rione Monti and Aia Piccola quarters. Matera's Sassi di Matera sprawl across two natural amphitheaters — Sasso Cavaioso and Sasso Barisano — where Byzantine monks carved rock churches with frescoes that survive intact after ten centuries. By 1952, forced evacuations relocated 15,000 residents from Matera's caves, deemed unfit for modern life. UNESCO listing in 1993 reversed that judgment, sparking a restoration campaign that converted 3,000 cave dwellings into hotels, restaurants, and museums. A UNESCO tour Alberobello and Matera by private bus from Bari covers 180 kilometers round-trip through Puglia's olive groves and Basilicata's clay valleys. Bari, the regional capital 55 kilometers north of Alberobello, serves as the departure point for most organized excursions. Private bus departures eliminate the logistical puzzle of car rentals and parking in pedestrian-only historic centers. The Valle d'Itria road between the two towns passes through Gioia del Colle and the Murgia plateau, where shepherds still graze flocks on public grazing lands. Alberobello's trulli tour Alberobello and Matera by private bus from Bari typically allocates two hours for the northern town, enough time to walk the cobbled lanes of Rione Monti, photograph the Trullo Sovrano — a two-story trullo rare for its internal staircase — and visit the Museo del Territorio. Matera receives three to four hours, reflecting the Sassi's larger scale. Guides lead groups through Casa Grotta, a furnished cave home frozen in 1950s domestic life, and the rock churches of Santa Lucia alle Malve and Madonna de Idris. The Gravina ravine, a 200-meter-deep limestone canyon separating the old town from the Murgia park, offers overlook viewpoints accessible by foot.