The Armory and Diamond Fund, with collections of early weaponry, carriages and jewels, are $11.30 each; $16 for foreign language tours.
Make sure you arrive in time for the English-language tour at 2pm (12pmh/£8.50).
The metropolitan police in Plaza Grande provide free English-language tour guides in the Old Town.
Foreign-language tour guides might command higher salaries, but is it ethical to charge two different prices?
Guided tours are available, but note that an English-language tour (tickets €9) must be booked in advance.
That was the per-person price for a Russian-language tour ($5.15), but since no Russians had signed up, she could guide me alone, in English.
Mid-week visitors can join the free English-language tour run by the Indonesian Heritage Society that meets in the entrance hall at 10.30am on Tuesdays and Thursdays.
There's an English-language tour every weekday at 3 p.m. (5 euros) that gets you into the parliamentary chamber, an elegant round-table hall decorated with contemporary Sami artwork, where the parliament meets four times a year.
The Fritz Music Tour (49-30-3087-5633; www.musicthers-berlin.com) provides the answer: the weekly English-language tour (19 euros) takes you by van to Bowie's old doorstep at Hauptstrasse 155.
How Space Shuttles Work (//www.howstuffworks.com/space-shuttle.htm) is a plain-language tour through onboard systems and life support, with a look at getting the craft into orbit, life in space, and re-entry, from Howstuffworks.com.com
Tickets for guided tours (in German with English leaflets unless you book an English-language tour) must be bought in advance for a set time, and they sell out early.
