Architecture in Azerbaijan typically combines elements of East and West. Many ancient architectural treasures such as the Maiden Tower and Palace of the Shirvanshahs in the walled city of Baku survive in modern Azerbaijan. Among other medieval architectural treasures reflecting the influence of several schools are the Shirvan shahs' palace in Baku, the Palace of Shaki Khans in the town of Shaki in north-central Azerbaijan, the Surakhany Temple on the Apsheron Peninsula, a number of bridges spanning the Aras River, and several mausoleums. In the nineteenth and early twentieth centuries, little monumental architecture was created, but distinctive residences were built in Baku and elsewhere. Among the most recent architectural monuments, the Baku subways are noted for their lavish decor. The urban planning and architectural activities are regulated by the State Committee for City Building and Architecture of Azerbaijan Republic.