AtlasObscura has a fascinating story about a recent Roman villa discovered hiding under a British backyard.  The villa dates back to 175 to 220 C.E.  And, it probably still stood up to around 1400 years ago.  The villa was probably 3 stories tall and had 20 or more rooms.

Sometimes there really is a secret world hiding in the backyard, just underneath the ground. In Wiltshire, in the south of England, one family decided to install some electric cables in the ground to light their converted barn. Just 18 inches under the soil, their work crew found mosaic stones in red, blue, and white.

When archaeologists showed up to see what they could find, they found the remains of an awe-inspiring Roman villa, that was once three stories tall, with 20 or more rooms just on the ground floor.

The villa must have belonged to a very wealthy family and would have been one of the most impressive buildings in the area. It’s one of the largest Roman houses ever found in England.
 

In addition to the well-crafted mosaic floor, archaeologist found brooches, coins, heating pipes in the floor, the remains of hunted animals and “extremely high status pottery,” the Independent reports. They also found the shells of oysters, that would have had to have been transported, in basins of salt water from the coast, 45 miles away.