We were staying right by City Hall so we decided to pop in. The clock is in a small room immediately as you enter City Hall. City Hall and the clock are both free. The clock is really neat to see. Right now it's under restoration so it's not moving but you can still see the parts. You won't be here long, but worth stopping by. I also recommend spending 10 minutes walking through the City Hall building as it's quite pretty as well.

Pretty interesting, but information is only limited to what’s provided in the small room holding the clock. Also, it’s currently not moving.

The clock wasn't in operation when I visited, but it was still an amazing piece of engineering - it took 20 years of calculations by hand to create the plans! It's in city hall which is also a beautiful building to see. Lots of people were getting married so it was fun sitting in the grand hall just people watching.

Must see Jens Olsen’s world clock, first door to right once inside. Absolutely a world treasure. One gear makes a full revolution only once per 25,753 years, and there are 15,448 moving parts. Absolutely amazing!

Jens Olsen's World Clock is situated in a side room at the Copenhagen city hall. Entry is free, although there are visiting hours indicated. Information about the clock can be found around the room in English and Danish. The day I visited the clock had not been wound, but nevertheless it's a large and fascinating clock that is worth a visit.

Couldn’t go inside because it was closed for restoration but It was good to see from outside as well.

This is an amazing piece of art/science. You can see all of the pieces of the clock at work some of which only make a complete rotation every 25,000 years! You won't be there for long but it's free and is truly unique.

This is a quick and very interesting stop. I have never seen anything like this impressive clock. The building of City Hall is beautiful.

This is a cool museum of you are in CPh and if you like clocks. So many different prototypes, movements, designs...

This is an often missed gem. Go see Todd click that will finish one complete cycle. 25,000+ years. That’s thinking ahead! A little English but mostly Danish.

Magnificent clock, a work of art and science. Stand around the back in the centre and watch the intricate movements. Beautifully hypnotic. Free entry is an added plus.

The clock is located the middle of the room and you can see both the dials and the back mechanism. It worth seeing it if you are close by and it's next to the entry in the building. Free entry, by the way.

Not my cup of tea. Interessting, but I was not amazed.

I wasn't inside Because of lack of time, but the building itself is worth reviewing with 5 stars.

Cool historic building

Currently closed for construction.

Nice historical place in copenhagen

Very interesting quick stop. Located inside the city hall building first door on right.

Very interesting to know