The Hague is the third city in the Netherlands with 500.000 habitants.
In Dutch it's Den Haag or 's Gravenhage.
It's not the capital of our country, that's Amsterdam and Rotterdam is the second town and is also a big harbour.
The Hague is quite important (also in history), because our government is settled there and our King has his "house" there. It's a big house, but not really a palace.
Another building there is the "Vredespaleis" or Peace Palace.