Cycling in Berlin
The cycling infrastructure in Berlin is good, and it is a flat and wide city which makes it excellent for cyclists.
Berlin is working on a special "Radgesetz" - a bike law that is striving for better cycling infrastructure and more acceptance of cyclists on the road.
Attractions/sights accessible by bicycle from the city centre:
Museuma Island, Belrin Wall, Prussian Berlin, Jewish Berlin, Brandenburg Gate, Reichstag, Governmental Buildings, Holocaus Meorial, Tiergarten, The river Spree, Gendarmenmarkt, and many more.
Mayor's stance on cycling:
By the "Radgesetz" they are forced to make a plan ;)
No problem if you have a good lock!
Cycling at night:
My company provides a night bike tour