Carlow Castle is a historic castle located in the town of Carlow in County Carlow, Ireland. The castle was built in the 13th century by William Marshal, the Earl of Pembroke, who was one of the most powerful men in Ireland at the time.

The castle is located on the banks of the River Barrow and was built to protect the important crossing point on the river. It was a strategic location that allowed the castle’s occupants to control traffic along the river and through the town of Carlow.

Carlow Castle has a square-shaped keep with walls that are over six feet thick. The castle was designed to be both a fortress and a residence, with a great hall and a number of living quarters. The castle also had a drawbridge, a moat, and other defensive features.

Over the centuries, Carlow Castle changed hands many times as various lords and rulers came and went. It was damaged and repaired several times, and played a role in many important historical events.

Today, Carlow Castle is a popular tourist attraction and is open to the public. Visitors can explore the castle’s ruins and learn about its fascinating history. The castle is also used as a venue for concerts and other events.