Berlin Cathedral, erected between 1894 and 1905 as a court church and burial place for the ruling Hohenzolles, is modelled on St. Peter's in Rome. The Emperor's box is well-worth seeing, as are the 100-od magnifficent coffins, including those of King Friederich I and Emperor Friederich III.
Dogs, Berliners and green city :-)
Berliners used to walk their well behavioured dogs often unleashed. Sometimes a dog was running after the bicycle of the owner like this one on my picture :-). There were a lot of green areas to walk dogs in Berlin. But in contrast to the USA generally grass was to look at not to walk on (maybe except just dogs).
In contrast to many other European cities, a lot of green areas and parks survived even in Berlin's downtown/central districts. The main streets or rather boulevards were wide and often with green belt at the center. Add quite many smaller green squares around the city. I would never guess that Berlin had 3.6 mln citizens.
We drove in from Dresden so the first thing I saw was this bizarre bridge in a park. It was gorgeous out but we had left later than we had planned. I would have normally asked to stop for a photo but I knew Doreen was tired and figured we could come back. It turned out to be Treptower Park and not exactly all that close to the city. After exploring town, I asked to go back out there our last day in town. It took a while to get there by mass transit and it was a gloomy day. It was a dirty rundown park but certainly a place for locals. The bridge itself was disappointing and showed me once again how bit a part expectations play in liking something. I hadn't expected anything when I first saw it, and it seemed amazing. After waiting a few days to get back there, it was really nothing special. Still, it offers a weird glimpse into a part of the city I imagine the tourist board would rather you not visit. lol
For budget travelers
Kaiser's is a chain of groceries or better to say small supermarkets quite popular at least in Germany and in... Hungary run by German Tengelmann company.
Kaiser's is a good choice esp. for a budget traveler looking for a nice selection of groceries. It's got the most of everything! And they stayed open longer at least as for Berlin.
Mon - Fri: 8.00 am - 8.00 pm
Sat.: 8.00 am - 4.00 pm Food and drink. Look for German beer (if you like) and crackings (good and relatively cheap). Low prices as for Berlin although usually at least 20-30% higher than in chain supermarkets in Poland.
Berlin's tranportation network is divided (pardon the pun) in three tariff zones, A (innermost), B and C (outskirts).
Funny enough, it's not possible to buy a ticket for only one tariff zone. It's either AB or BC or ABC. AB basically covers Berlin without its suburbs and should be the best choice for tourists. That is, even if you arrive at Schoenefeld airport, which is somewhat outside of Berlin. While the airport itself is situated in the C-zone, it's only a 5-minute walk to Schoenefeld Station, located in the B-zone.
The only reason to buy a ticket that covers the C-zone would be to visit Potsdam with Sanssouci Palace and the Dutch Quarter. In this case, just purchse an extension ticket for the C zone the day you want to visit Potsdam.
Where to buy:
There are ticket vending machines at every subway or S-Bahn station, as well as on trams. Bus drivers sell tickets, too (at no additional charge). Some hotels have tickets in stock.
Validate your ticket BEFORE entering the train, and only ONCE, even if you change trains.
Each ticket is valid for basically all modes of transportation, including some ferries.
Children below six travel free of charge. Same goes for luggage and baby carriages, albeit not for bicylces.
Children aged 6 - 14 (as well as dogs) pay a reduced fare, unless it's an already discounted ticket. In this case, children pay the full fare, whereas one dog is usually allowed to travel free.
Most buses are lower floor buses, so wheelchair-users won't face much trouble. The typical double-decker bus, however, has a ramp and is quite crampy.
Whether or not a particular S-Bahn or subway station is easily accessible for wheelchair users (or other people who need an erscalator) can be seen on the network map.
Prices for standard tickets:
Standard day pass: EUR 6.10
Single ticket: EUR 2.10 (1.40 reduced; valid for 2 hours in one direction)
Short trip: EUR 1.30 (1.00 reduced; valid for three stops on the S-Bahn or Underground, 5 stops on trams and busses.
Safety / Reliability:
Generally a non-issue.
I never felt particularely comfortable at Schoenefeld Station nor at Ostbahnhof, but this is more due to the somewhat sad GDR architecture. Most trains have surveillance cameras, emergency intercom systems, and security is patrolling trains quite frequently.
Trains and buses are usually clean and punctually (unless there's a strike again).
Take the usual precaution and you're fine.
It would my advise, however, not to use public transport at New Year's Eve. If you plan on spending NYE in Berlin, try to find an accomodation in either Mitte, Prenzlauer Berg or Friedrichshain, celebrate NYE just there, and walk home or take a taxi.