What did Karel IV build?

Karel IV, also known as Charles IV, was a significant figure in Czech history and the Holy Roman Empire. He is best known for founding Charles University in Prague in 1348, which is one of the oldest universities in Europe. Additionally, he commissioned the construction of notable structures such as the Charles Bridge and the St. Vitus Cathedral, both of which remain iconic landmarks in Prague today. His reign is often associated with the cultural and architectural flourishing of the Czech lands.