We had never before visited Budapest. It is a staggeringly beautiful city.
Unfortunately, we had less than 24 hours in the city. Our decisions of what to visit ended up not being that tough, though. We were there on New Year's Eve--a holiday when most everything is closed--in the midst of the coldest winter in forty years. So, inside attractions that were open were what we were looking for.
That's how we ended up in the Castle Labyrinth. It's a large underground network of caves and passages under the castle that probably has some fascinating history (dungeons? wine cellars? bomb shelters?) which we can't seem to find anywhere. The attraction now is filled with visual jokes--faux archaeological remnants of Homo Consumerus, like a giant fossilized Coke bottle--that you can explore with oil lamps. It was so strange that I don't think any of us will forget it, but I wouldn't go so far as to recommend it.
Unless, of course, you're there on a freezing cold holiday.