Trier Catherdral

Trier, Germany

http://www.sacred-destinations.com/germany/trier-cathedral
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Architecture: Early Christian/ Byzantine

The biggest structure in Trier, Germany, the cathedral began construction 326 AD by Constantine to celebrate his 20th anniverary of reign. The original structure was four times bigger than the present day church, but after taking constant damage in the 5th and 9th century, the remains were enlarged and the styles of Romanesque, Gothic and Baroque were all added at a later date.

I like the structure as it brings a sence of 'Big' and 'Bulky' and has also been mistaken as a fortress.