58 Airports.
How many have you visited?

Changi has a 40-meter indoor waterfall, the tallest in the world, plus a butterfly garden with 1,000 butterflies and free movie theaters.

Why go: Walk the canopy bridge, swim in the rooftop pool, and explore the forest valley. A long layover here can easily fill a day.

Haneda is one of the world's busiest airports and is known for running on time. Its domestic terminals have Japanese gardens and ramen shops.

Why go: Eat at the terminal restaurants, relax in the Japanese gardens, and see how smoothly a very busy airport can run.

Dubai International handles more international passengers than any other airport and runs the largest duty-free shopping operation in the world.

Why go: Shop the large duty-free area and see Emirates' Terminal 3. Relax in a lounge and try food from around the world.

At peak times a plane takes off or lands at Heathrow every 45 seconds. The airport has run continuously since 1946 and handles more than 80 million passengers a year.

Why go: Watch planes from around the world come and go at one of Europe's busiest hubs, and shop duty-free between flights.

Denver is the largest US airport by total area. Conspiracy theories surround its murals, its alleged underground bunkers, and its "Blue Mustang" sculpture, which killed its creator.

Why go: See "Blucifer," the blue horse with glowing red eyes, and the murals. Look up at the tent-like roof, designed to echo the Rocky Mountains, and find the dedication stone.

Hong Kong International is built largely on land reclaimed from the sea. It replaced Kai Tak Airport, which was known for its difficult landing approach.

Why go: Walk the large terminals and watch planes take off and land at an airport built out from the sea.

Schiphol has a small branch of the Rijksmuseum that shows Dutch Golden Age paintings between the gates. The airport sits 13 feet below sea level and opened in 1916.

Why go: See Rijksmuseum paintings while you wait for your flight, then browse the tulip shop.

Incheon has a free Korean culture museum, craft workshops, and live traditional music and dance throughout the day. It has won "Best Airport Worldwide" several times.

Why go: Try on hanbok, watch traditional performances, and learn a Korean craft without leaving the terminal. Visit the culture museum between flights.