The Royal Palace of the Oba of Benin is a sacred site therefore you should not do any of these while visiting the Obas palace.
The Royal Palace of the Oba of Benin is the most prestigious sites in Benin and one of the top things to see when in Benin City, Edo state. It is one of the most famous Royal Houses in the whole of Africa. It is The palace, built by Oba Ewedo (1255AD – 1280AD), is situated at the heart of ancient City of Benin. It was rebuilt by Oba Eweka II (1914 – 1932) after the 1897 war during which it was destroyed by the British. The palace was declared a UNESCO Listed Heritage Site in 1999.
It is seen as a sacred site so it has its dos and don'ts — including no wearing of black, no whistling, no pointing at the Oba or his chiefs, etc.