Best free things to do in Berlin?

Hi! An amazing place for free is the roof terrace of the Bundestag, more information you will find here: http://www.bundestag.de/htdocs_e/visits/kuppel All the best, Ilze

you should visit MauerPark flea market

Definitely the Bundestag you get an entire guided tour and a chance to go to the top of the dome! Make sure you pre-book your visit though. The Topography of Terror , Brandenburg Gate, Checkpoint Charlie and Holocaust Memorial are the iconic free sites. There are also other spots like along Bernauer Straße where you can see the wall.  If you start around the Alexanderplatz area and stroll down to the Brandenburg Gate you get a lot of the major sites (Museum Island, site of Hitler's book burning, Tiergarten, Berliner Dom, etc.), it's a very vibrant area. If you want to visit the Museum Island museums a day pass to all the museums is 18 Euro which gets you quite a bit of bang for your buck, we started early on a rainy day and visited 4 of the 5 museums. 

Hi Valerie!

You're in luck because Berlin is a really inexpensive city, and even most of the typically touristy things to do are free!  The East Side Gallery (Berlin)for example is free to walk along.  Additionally, the Holocaust Memorial ( & the museum inside of it), the Bundestag (but sign up online beforehand to get in) and Checkpoint Charlieare also free to see.  

For something a little more off the beaten path, there's a number of great parks like Mauerparkand the old airport Tempelhofer Field(the former which offers an amazing flea market on Sundays).  If markets are what you're after, check out Neue Heimattoo, something a little cooler and new with everything from the traditional flea market to streetfood, to art.  Street art can also be found walking along the streets in Kreuzbergand Friedrichshain

I can't let you go without talking about food really quick, since that's my specialty after all :). Great streetfood can be found at Markthalle Neun, Bite Club (near Arena Club and Badeschiff along the water) and the previously mentioned Neue Heimat.  Other inexpensive food faves include: Mustafa's Gemüse Kebap, Burgermeister, Maroush, Tommis Burger Joint, Cô Cô - Bánh mì deli, Roamersand Nalu Diner.

Hope this helps and enjoy your stay in Berlin! 

Renting a bike is almost for free. Then you can ride along where the Berlin Wall Memorial. That is amazing!