St Johns the Baptist Church
St John the Baptist Church can be found next to the market in Cardiff's city centre, and is not only Cardiff central's oldest castle, but is said to be the oldest building in Wales's Capital that's still in use (except for parts of the Castle). It was originally built as a Chapel of Ease (a church built for those who lived too far away from the Parish church) in 1180, and was first constructed a type of Jurassic stone that has layers of fossilized shells.
The church was sadly looted and captured during one of Owain Glyndwr's rebellions in 1404, and suffered some severe damage. Though thankfully it was rebuilt in the late 1400's (it is believed to have been completed around 1490), with the addition of a right-angled tower containing 10 bells. Extensive reconstruction and extensions to the Church were also made during 1886-1897, including the rebuilding of the churchyard wall. Materials such as red sandstone and Devon sandstone from the Forest of Dean were used.
In 1607 this 'Chapel of Ease' became a dual-location Parish for the congregation of St Mary's, after the foundations of St Mary's church were destroyed by the Bristol chanel flood. St John's later became the main church for services in 1620.
In 1952, St John the Baptist Church became a Grade I listed building, and is now visited by 1,000 people per week. Entrance is free.