Lung Yeuk Tau — the name translates roughly as "dragon's ascending ridge" — is not a single village but a cluster of eleven settlements: five walled villages, known as the Five Wai, and six open villages, the Six Tsuen. All of them trace their founding to the Tang clan, one of the great indigenous lineages of the New Territories, who established themselves in this valley during the Song Dynasty. Lo Wai is the oldest of the five.

The walled-village form itself speaks to the conditions under which these communities developed. External walls, watchtowers, a single controlled entrance: the architecture of a community that needed to defend what it had built. In the Pearl River Delta region and across the New Territories, dozens of walled villages went up during the Ming and Qing dynasties as clans sought to protect their people and their ancestral halls from banditry and inter-clan conflict. Lo Wai's walls are the physical memory of that period.

Inside Lo Wai, the lanes are narrow and the houses close together, following a plan that has not changed fundamentally in centuries. A water well stands near the entrance tower, still visible to visitors. The entrance tower itself — the focal point of the village's defensive architecture — anchors the eastern face of the enclosure, relocated there from its original northern position for feng shui reasons. Beyond it, the walled perimeter runs in a rough rectangle, and within that rectangle generations of Tang clan families have lived.

The entire village is now located along the Lung Yeuk Tau Heritage Trail, a walking route that connects the notable historic sites of the valley. The trail links Lo Wai to the Tang Chung Ling Ancestral Hall, which sits between Lo Wai and the neighbouring village of Tsz Tong Tsuen. The Ancestral Hall is one of the most significant traditional Chinese buildings in Hong Kong. Together, the hall and the walled village form the core of what remains of Lung Yeuk Tau's pre-colonial history.

The entrance tower and enclosing walls of Lo Wai were declared monuments under the Antiquities and Monuments Ordinance of Hong Kong, placing them alongside landmarks such as the Kowloon Walled City remains and the Tung Chung Fort. The designation protects the structures from alteration or demolition, and it has ensured that Lo Wai remains visually intact in a way that many of Hong Kong's other historic buildings are not.

But Lo Wai is not a museum. It is a recognized village under the New Territories Small House Policy, which means that indigenous male villagers of Tang clan descent retain certain rights to build within the village's established boundary. The village has representation in the Fanling District Rural Committee and falls within the Queen's Hill constituency for electoral purposes. People live here. The declared monument is also someone's home — or rather, the gate through which people have been walking in and out for many hundreds of years.

Standing outside Lo Wai's entrance tower, looking back at the low granite hills of the northern New Territories, it is easy to understand why this valley was chosen. The hills offer some shelter; the valley floor, though modest, provided cultivable land. The proximity of what is now Fanling — today served by the MTR East Rail line — gave the settlements connections to wider trade networks.

The Lung Yeuk Tau Heritage Trail takes perhaps two hours to walk in full, winding between the walled villages, the ancestral halls, the temples and pavilions that mark the history of the Tang clan presence here. Lo Wai is the trail's oldest stop. Its walls have absorbed six or seven centuries of weather, and the entrance tower has watched every generation of the valley pass through it. The surrounding new towns of Fanling and Sheung Shui have grown enormously since the 1970s, but this small rectangle of walls and lanes remains as it was — declared historic, still inhabited, still entered the same way.