Curiosity Zone is a kid-sized science lab for kids ages 2-11. Classes build on kids’ natural curiosity, using familiar, fun, hands-on activities to inspire them to think creatively about the world around them. It’s located at 43135 Broadlands Center Plaza, Suite 123, Ashburn, VA 20148, Tel.: 703-723-9949.
My daughter went to a birthday party there today, and she had a fun time. She absolutely loved the science experiments and was happy to take home her very own bleaker, funnel and dropper. She wants to make more potions at home. The staff was great and very friendly too. They have other fun activities including a shadow board, which allows your kid to make shadows on a glow-in-the-dark board. In addition to their party room, they have a store front, which your child will likely have a hard time passing by without asking to buy something small. 
We bought snakes!
Curious? Have your next birthday party at Curiosity Zone!