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Photo: CEphoto, Uwe Aranas, CC BY-SA 3.0 via Wikimedia Commons
The official residence of the King (Yang Di-Pertuan Agong) of Malaysia. You can get a glance at this gigantic building by going to the main entrance (see geo marker). If the flag is raised up on top of the largest dome of the palace, then the king is inside. Else the king has left the complex. At 11AM each day there is a changing of the guard. Open to the public once a year on Hari Raya Aidilfitri (Eid al-Fitr), during which you can exchange greetings with the king, and lunch is served to visitors for free.
The Istana Negara is the official residence of the Yang di-Pertuan Agong. It is located along Jalan Tuanku Abdul Halim near Taman Duta, northwestern Kuala Lumpur. The palace opened in 2011 and replaced the old Istana Negara which was located at a different compound in central Kuala Lumpur.
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Masjid Wilayah Persekutuan
This large mosque, which was opened in 2000, was partly inspired by the Blue Mosque in Istanbul. The mosque's website is in Malay only. Statistics on the number of tourist visits are given, so it is clearly possible to visit the mosque outside of prayer times, but the website doesn't seem to make clear what arrangements would be needed, so it might be a good idea to call, especially if you're a non-Muslim interested in seeing the interior outside of prayer times. If you are a Muslim and would like to pray at the mosque, prayer times are prominently displayed on the website.
Kompleks Mahkamah
It is said that this Court Complex is the second largest in the world behind the one in India. Although not overly touristy, the arial view of the court resembles a Y-Wing Plane from Star Wars. To get there, Head on to Jalan Khidmat Usaha from Jalan Duta and the court can be seen at your right.
Pusat Sains Negara
Well done science museum, which is especially great, if you come with children.
The most popular spot in the whole city to go mountainbiking or hiking. Unfortunately the forest is constantly reduced in size by greedy building developers.