If you’re looking for a holiday activity for the family this week, head over to NorthPark Center for the 24th annual Trains at NorthPark. It’s a huge model train exhibit that has become a mall tradition. Plus, it’s for a good cause. Ticket sales benefit the Ronald McDonald House of Dallas.

The display debuted Saturday and features 24 Lionel model train sets with about 1,600 feet of track through elaborate cities including Dallas, San Francisco, New York City and Washington D.C.. Landmark scenes include the North Pole, the State Fair and Route 66 to name a few. There are hundreds of buildings and thousands of figurines.

It’s located on level two between Barney’s and Nordstrom. Tickets are $6 for adults, $3 for children age 2-12 and free for senior citizens and kids under 2. Check out the complete schedule of hours for the exhibit, which runs through Jan. 1.