Monolithic gates still protect Amersfoort, a well-preserved medieval city that remains connected to its history. Built into the foundations of 13th-century defensive walls, the Muurhuizen wall houses are one of the city’s most intriguing features. Art enthusiasts should visit the Mondriaan House (birthplace of abstract artist Piet Mondriaan) and the Armando Museum, a collection of works by the famed Dutch painter.