Near Belmonte, in central Portugal, stands one of the country's most unusual Roman ruins.
It's called Centum Cellas, and for centuries, nobody knew exactly what it was built for.
Some believed it was a temple, others a military tower or even a prison with 100 cells.
But archaeological excavations in the 1990s revealed that the building was probably part of a much larger Roman villa, dating back to the 1st century AD.
What makes it so fascinating is its strange architecture, with enormous granite blocks, unusual windows and walls that have survived for almost 2,000 years.
Today, Centum Cellas is a National Monument, located in Colmeal da Torre, near Belmonte.
What do you think this building looks like?
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