Cedar Creek Treehouse "Stairway to Heaven" Mount Rainier, WA. 82 ft into the sky, climbers face challenge: a rainbow-colored suspension bridge that stretches 43 feet over the forest floor.

The Gray, Milan. Boutique hotel in central Milan. One of the most spectacular results is a sprawling duplex suite connected by this floating stairway.

Flickr is almost certainly the best online photo management and sharing application in the world. Show off your favorite photos and videos to the world, securely and privately show content to your friends and family, or blog the photos and videos you take with a cameraphone.

This beautiful public art installation was created by Horst Gläsker, who applied acrylic paint to each of 112 outdoor steps in Wuppertal, Germany. Each step is a different color and bears a different German word.

Tulip Stairs, Greenwich, England. The Queen's house in Greenwich features the 1st geometric self-supporting spiral staircase.

It looks like any old roller coaster, with curves and heart-stopping loops. But instead of zooming by, people are walking—on inclines fitted with steps. This creation in Germany’s Rhine Valley is an interactive sculpture, but it’s also one of the world’s most unique staircases.While staircases are fundamentally a means to get from one point to another, they become cool—and worth seeking out—when the form is made at least as important as the function. Whether in shops, museums, or the great…

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It looks like any old roller coaster, with curves and heart-stopping loops. But instead of zooming by, people are walking—on inclines fitted with steps. This creation in Germany’s Rhine Valley is an interactive sculpture, but it’s also one of the world’s most unique staircases.While staircases are fundamentally a means to get from one point to another, they become cool—and worth seeking out—when the form is made at least as important as the function. Whether in shops, museums, or the great…

Facts and travel tips about facts about Casa Batllo, an architecture landmark in Spain

Loretto Chapel Staircase, Santa Fe, NM. A masterpiece and a mystery of woodworking, this sprial structure is entirely self supporting, without and central column to provide stability and with wooden pegs instead of nails.

Vatican Museums' Spiral Staircase, Rome. Giuseppe Momo created wide ramplike steps and two separate helixes of the spiral staircase so that one leads up and the other goes down—twisting together into a double-helix formation decades before Watson and Crick discovered the structure of DNA.

Las Pozas, Xilitla, Mexico. Surrealist sculpture garden took more than 2 decades to complete and covers 80-plus acres of Mexican jungle and groovy structures like the "Stairway to the Sky", a winding staircase you can climb up several stories.

Staircases that are so cool they make us a little sick.

16th Avenue Mosaic Staircase, San Francisco. 163 mosaic panels - one for each step - that make up this staircase.

Tiger & Turtle - Magic Mountain, Duisburg, Germany.