The Fujian tulou, which translates to "earthen building," are historical homes that were primarily built from wood and mud.
In 2008, 46 tulous were added to the UNESCO World Heritage list.
While the homes have become a tourist attraction, some people still live in these multi-floor forts.
In southeastern China's Fujian Province, there are giant fort-like structures among the mountains.
And in the event of a conflict, these massive group homes could double as forts.
In contrast to the imposing exteriors, the interior spaces of the homes are designed for communal living.
While most of these homes are donut shaped, they can also have a square floor plan.
But despite being open to tourists, many elderly residents still call these buildings their homes.