The Tokyo Skytree, twice as tall as the Eiffel Tower, and its surrounding retail and office complex opened on Tuesday to an estimated 200,000 visitors. (Haruyoshi Yamaguchi/Bloomberg)

The observation decks of the tallest tower in the world opened to the public on Tuesday. Here are six important facts and figures to know about Skytree, pulled from the Associated Press.

* Skytree is the tallest tower in the world. It is 2,080 feet tall (634 meters), just edging out the Canton Tower in China (1,969.5 feet, or 600 meters).

* Skytree is not the tallest structure in the world. That would be Dubai’s 2,717-foot Burj Khalifa. What’s the difference? The Burj Khalifa is a skyscraper, which is a different category of building.

* How tall is 2,080 feet? Twice the height of the Eiffel Tower. How’s that for perspective?

* Pairing form with function, Skytree will serve as a TV and radio broadcast tower. It replaces the old Tokyo Tower, which stood just half its height at 1,092.5 feet.

* Nearly 8,000 people were expected at the opening, Some of these visitors waited more than a week for the chance. They were disappointed with fog obstructing the views from above.

* Skytree is painted its own color: “Skytree White.” The design is based on “aijiro,” a traditional Japanese light blue that helps the tower join its surroundings.

Visitors to the tallest tower in the world will surely want something to remember the trip. Luckily (naturally?) Skytree has endless amounts of gift shop swag. Below are photos we collected of the best souvenirs and ephemera available to the public.

Experience the view for yourself. Check out this video from on the scene at the Tokyo Skytree opening: