I am the house of both, The Commoners and The Lords. I was completed in 1860 and my creators are Sir Charles Barry and A.W.N. Pugin. What am I?

I am an old castle in Slovakia, initially made of wood in 12th century. Later a man named Count Janos Ferenc Palffy remade me into a romantic reconstruction in 1910. Now I am now a part of Slovak National Museum. What am I?

I am one of the seven wonders of the world well hidden by the mountains in the desert, not yet fully explored. Also known as city of Roses because of the stone I am carved out of; I am believed to be established in 312 BC. I was articulated with ponds and greenery where water was brought via pipes in the middle of the Dessert. What am I?

 I am a monument and mosque whose landmark structure has now also been incorporated as the state emblem of Telangana. Surrounded by popular and busy local markets, the monument has got a lot to do with number ‘4’. What am I?