Listed under 'children's attractions' in guidebooks, but a fascinating Communist survivor (1948) for visitors of all ages. Children ('Pioneers' back then) drive the narrow gauge trains, take your tickets and salute you at the stations. A bonus: to get there you can ride on the (adult-run) Cogwheel Railway to Széchényi-hegy.
www.gyermekvasut.hu/english/chrw_home.php
MAV Zrt. Szechenyi-hegyi Gyermekvasut
1280 Budapest, Pf.: 27, Hungary