A massive 673-foot observation tower has been proposed for a site in Denver’s Central Business District.

DENVER — A newly proposed 673-foot observation tower could become one of the tallest structures in Denver — if it ever gets ...

What's being hailed as the world's tallest 3D-printed building is being readied for assembly in a remote Swiss village. The White Tower from researchers at ETH Zurich will be formed from over a ...

The Spiral rises 66 stories to reach a height of 1,031 feet, falling short of its neighbor, 30 Hudson Yards, which rises 1,296 feet. Initially conceived in 2014, the tower was slated to be titled ...

That influenced Vartan’s decision to have his portion of the spiral staircase painted ochre-yellow, which, in 1892, became the second of six total colors the tower has sported over its lifetime.