Last Updated: 16th Feb 2011
For a great view of the city (especially at night) go to the top of the Eiffel Tower at Paris. It also offers a great vantage point for viewing the water show at the Bellagio.
MOMA is well worth a visit, and if you're short on cash, has free entry between 4pm-8pm on Friday nights. It does get very crowded though...
Christmas Markets in Vienna are great. Buy some mulled wine (Gluhwein in German)which is served hot and is quite spicy. The mug it comes in is yours to keep - a great souvenir -but if you don't want it return it and get your €2 deposit back (Pfand).