Don't know if this one is iconic but it's a great concept.
Hydropolis - Worlds 1st Underwater Hotel in Arabian Sea
Hydropolis - Worlds 1st Underwater Hotel in Arabian Sea

Hydropolis -Worlds1st Underwater Hotel in Arabian Sea
FTFY
While that is indeed the first underwater hotel in the Arabian Sea, there have been underwater hotels in other parts of the world for many years. The first one was opened off the coast of Florida back in the 1980's. The premier one these days seems to be the Poseidon in Fiji, although this Hydropolis looks set to give it a run for its money.
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What makes this iconic is the fact that it was a ground breaking use of reinforced concrete, it took Utzon and Ove Arup and Partners some five years to solve the roof. In their search for a solution, a variety of geometries were investigated leading to Utzon’s proposal for a spherical solution which was ultimately adopted as the simplest and least complex geometry for determining the roof shape.
Ove Arup and Partners explored a range of constructions starting with Utzon’s suggestion for a single skin reinforced concrete shell with stiffening ribs. Double skin and space frame solutions were seriously debated before the present precast hollow ribbed vault was adopted.
What about buildings that are in the process of design/construction?
The Urban Cactus in Rotterdam is an interesting looking piece of work, presently under construction.
I like it, it definately one of a kind I'd like to see more of. For some reason I'm not getting the picture just before this one. Maybe you can fix it?
Thank you for letting me know, as it was showing on this end. It may have been a copyright image that was hosted on the site that I was linking to.
Here is a link to the site so that you can view the previous image and the somewhat entertaining copy.
http://www.google.ca/imgres?q=baske...5&tbnw=142&start=0&ndsp=18&ved=1t:429,r:1,s:0