The arrival of Islam in what is today Pakistan meant the sudden end of Buddhist architecture in the area and a smooth transition to the predominantly pictureless Islamic architecture. The most important Indo-Islamic-style building still standing is the tomb of the Shah Rukn-i-Alam in Multan. During the Mughal era, design elements of Persian-Islamic architecture were fused with and often produced playful forms of Hindustani art. Lahore, as the occasional residence of Mughal rulers, contains many important buildings from the empire. Most prominent among them are the Badshahi Mosque, the fortress of Lahore with the famous Alamgiri Gate, the colourful, Mughal-style Wazir Khan Mosque, the Shalimar Gardens in Lahore, and the Shahjahan Mosque in Thatta. In the British colonial period, predominantly functional buildings of the Indo-European representative style developed from a mixture of European and Indian-Islamic components. Post-colonial national identity is expressed in modern structures such as the Faisal Mosque, the Minar-e-Pakistan, and the Mazar-e-Quaid. Several examples of architectural infrastructure demonstrating the influence of British design can be found in Lahore, Peshawar, and Karachi.