Veliko Tarnovo is a city in north central Bulgaria. Often referred to as the "City of the Tsars", Veliko Tarnovo is located on the Yantra River and is famous as the historical capital of the Second Bulgarian Empire, attracting many tourists with its unique architecture.
Eero Saarinen, late 1940's General Motors Technical Centre in Warren, Michigan - huge helical staircase supported using innovative/complex stainless steel rod suspension system