The origins of the trulli

The building technique behind the trulli is far older than the houses themselves. Dry-stone construction, stacking limestone without mortar so that it holds through weight and balance alone, has been used across the Mediterranean for thousands of years. In the Itria Valley, builders found an ideal material in the flat limestone lying just beneath the surface. Many of the trulli standing today were built between the seventeenth and nineteenth centuries, though the technique itself dates back much further.

A house built without mortar

One of the most enduring stories about the trulli relates to taxation. Under the Kingdom of Naples, new permanent settlements could be subject to taxes and royal approval. The Counts of Conversano, who controlled the area around Alberobello, are believed to have encouraged the construction of dry-stone dwellings without mortar. Because they could theoretically be dismantled more easily than conventional houses, they may have helped landowners avoid certain taxes and regulations. Whether entirely fact or partly local legend, the story remains closely linked to the identity of the trulli.

The practice also reflected the realities of rural life. Limestone was abundant, skilled stonemasons were readily available, and dry-stone construction allowed farmers to build durable homes using materials gathered directly from the surrounding land.

How a trullo is built

A traditional trullo consists of thick double-layered stone walls with a cavity between them, helping to keep interiors cool in summer and warm during winter. The roof is its most remarkable feature. Thin limestone slabs, known as chiancarelle, are laid in gradually narrowing rings until the cone closes at the top. No beams, no cement, just carefully balanced stone.

Many roofs are finished with decorative pinnacles, whose shapes vary from spheres and discs to crosses. They are often thought to reflect the work of individual builders, local traditions, or symbolic meanings passed down through generations.

Symbols on the roofs

Many trulli display white symbols painted onto their roofs. Some are Christian in origin, such as crosses or hearts, while others draw on older folk beliefs, astrology, and local traditions. Rather than decoration alone, these markings were often intended to offer protection, good fortune, or blessings for the household.

While their meanings have evolved, the symbols remain one of the most distinctive features of the trulli landscape and contribute to the unique character of the region.

Alberobello and the Itria Valley today

Alberobello is home to the largest concentration of trulli in the world, with more than 1,500 preserved examples spread across the districts of Rione Monti and Aia Piccola. In 1996, the town was recognised as a UNESCO World Heritage Site, celebrating a building tradition unique to this part of southern Italy.

Beyond Alberobello, trulli remain scattered throughout the Itria Valley, often surrounded by vineyards, olive groves, and working farms. Here, the landscape is shaped as much by drystone walls and centuries-old olive trees as by the distinctive conical roofs themselves.

Staying in a trullo

The best way to appreciate a trullo is to spend time inside one. Many have been carefully restored, preserving their original architecture while introducing modern comforts. Thick stone walls, curved alcoves, and naturally cool interiors create an atmosphere unlike any other accommodation in Italy.

What began as a practical response to local circumstances has become one of Puglia’s most enduring architectural symbols. For travellers, staying in a trullo offers a rare opportunity to experience a building tradition that has shaped the region for centuries.

For those inspired by this unique heritage, several accommodations in the Nice2stay collection are beautifully restored trulli, offering an authentic way to experience the character, history, and slower rhythm of life in the Itria Valley.