Today I added Yellowstone National Park to the Duckwyn Travel Passport. It's the 7th park to be added to the collection. The park is so vast that you may need to enter the park before you can collect your stamp. Yellowstone has a lot to offer from geysers, to wildlife, to volcanic activity, lakes, and mountains, your family will love the adventure.

According to Wikipedia, there are over 1200 geysers and at least 10,000 thermal features. The 3400 square miles of the park contain hundreds of animal species and over 1700 plant species. Yellowstone is a unique place and beautiful area to explore and get close to nature.

Today, the Great Smoky Mountains joins our list of national parks. Visit the park with your Duckwyn Travel Passport to collect your stamp. If you answer the 3 trivia questions then a new badge will also be added to your collection.

We're steadily adding more national parks each week. Zion and Yellowstone will be coming soon.

Last week, the following new cities and destinations were added. There were also some bug fixes and UI updates.

• Added Vancouver, Reykjavík, Doha and Dubai to the World City Tour
• Added Pearl Harbor and Fort McHenry to the list of destinations
• Fixed bug in Safari that prevented city stickers from showing on the World City Tour page
• Improved direction marker orientation on non-iOS devices
• Added new fort icon