Zagreb is the capital of Croatia. It's a big city, with around a million inhabitants
To get into Croatia, since is member of the European Union, you just need to show your ID in the passport control, as long as you are European.
Their currency is the "Kuna".But they may let you pay in € in some places.
I was lucky enough to visit Zagreb by bike. So I could go everywhere without wasting time. Otherwise you can use buses and tramps.
In the tourist information they just gave me a map, with a couple of circuits I had to follow in order to see the most important places in town. I kind of followed them, but as I love getting lost without using maps, I just made my own way.
The cathedral is really nice, but when I visited it was under construction works.
In the lower town, next to the art pavilion, there's a really nice park, where you can sit and enjoy when the weather is nice.
Zagreb has many museums, but the most famous is probably the broken relationships museum. Where the people donate the objects which remind them their ex. It costs around 3€
I also went to the Mirogoj Cementery. It's huge. There's a monument to the soldiers in the first and the second world war.
One thing I loved about Zagreb, was that there're markets in every neighborhood. They sell fresh fruit, really cheap, and really good quality. This is the most popular. Dolac Market. Just next to the Cathedral.