Architectural viewpoints have been in the news lately with the opening of BIG's helical Marsk Tower and controversy surrounding MVRDV's Marble Arch Mound and Thomas Heatherwick's Vessel. Here are 10 impressive lookouts from Dezeen's archive.

Vlooyberg Tower by Close to Bone
Engineering studio Close to Bone created an 11.5-metre-high cantilevered staircase as a unique viewpoint in Flanders, Belgium.
Named Vlooyberg Tower, the free observation tower was constructed from orange weathering steel to avoid acts of arson, which destroyed the wooden tower that formerly sat on the site.
However, in 2018 the gravity-defying structure was severely damaged in an apparent explosion. The structure was repaired and reopened later that year.
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Forest Tower at Camp Adventure by EFFEKT
The helical Forest Tower at Camp Adventure, Denmark's largest climbing camp, was designed by Danish architecture studio EFFEKT.
Hourglass in shape, the weathering steel viewpoint, which costs 150 kr (?20) to climb, allows visitors to walk amongst the treetops by ascending a spiralling ramp that curves 45 metres above the ground.
Find out more about Forest Tower ?

Marsk Tower by BIG
Designed with a double helix structure informed by DNA, Marsk Tower by architecture studio BIG recently been completed at the Wadden Sea National Park in Denmark.
The Corten steel tower, which costs 90 kr (?12) to climb has views of surrounding UNESCO World Heritage-listed marshland.
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