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Photo: Dungodung, CC BY-SA 3.0 via Wikimedia Commons
Nikola Tesla (Никола Тесла, 1856-1943) made huge contributions to electric engineering, pioneering alternating current (enabling long-distance high-energy transfer), radio (underpinning today's mobile comms) and AC motors as used in household and office machinery. Half of this small museum is dedicated to Tesla's personal effects, while the other half contains models of his inventions. English-speaking tours start at the full hour and include demonstrations. Long lines build up at peak hours.
The Nikola Tesla Museum is a science museum located in Belgrade in Serbia. It is dedicated to honoring and displaying the life and work of Nikola Tesla as well as the final resting place for Tesla. It holds more than 160,000 original documents, over 2,000 books and journals, over 1,200 historical technical exhibits, over 1,500 photographs and photo plates of original, technical objects, instruments and apparatus, and over 1,000 plans and drawings. Very little is on display in the small ground floor exhibition space.
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Crkva Sv Marka / Црква Св Марка
Large Serbian Orthodox church built 1931-40 in Serbo-Byzantine style. Within are the tombs of King Stefan Uroš IV Dušan (1308-55), and of King Aleksandar I Obrenović (1876-1903) and his Queen Draga Mašin.
Hram Svetog Save / Храм Светог Саве
The largest church in Serbia and one of the largest Orthodox churches in the world, under construction since 1935 and still not entirely finished. It's described as a temple (Hram) to distinguish it from the smaller St Sava Church (Tsrkva) adjacent. The crypt (downstairs from the main entrance) is an extensive, bright and polished area with walls covered with modern iconography, so it looks more like a metro interchange for Orthodox saints than a religious building. Services are held regularly here and in the Church, which you can also visit.
Narodna Skupština / Народна Скупштина
Grand neo-baroque legislative palace, built 1907-36.
Стари Двор
This was the residence of the Obrenović and Karađorđević princely dynasties from 1884 until 1922. It now houses Belgrade City Assembly, no visits except on business.
Историјски Музеј Србије
Huge collection of materials about the Serbian nation from ancient times to the present. In the coming years it's intended to move to new premises on the site of the former railway station.
Family-friendly place with all the fairground usuals: distorting mirrors, Ames Room, and so on.