The art or prastice of designing and constructing buildings is known as architecture. The definite origin of architecture could be related to the neolithic era around 10000 BC or simply when people stopped living in caves and began planning how they want their house to be. 
The first architect in history is Imhotep, who designed the pyramid of Djoser ( the step pyramid) at Saqqara in Egypt in 2630 - BC.
There were two main architectural types known as Greek architecture and Roman architecture. Ancient Greek architecture evolved into three distinct orders: The Doric, Ionic and Corinthian orders.
The seven most recognised architectural designs in many prestigious buildings around the globe are Greek and Roman classical architecture, Baroque architecture, Victorian architecture, Gothic architecture, neoclassical architecture, post-modern architecture and neo-futurist architecture.
Greek architecture is remarkable for tall columns, intricate details, symmetry, harmony and stability.
The Greeks built all types of buildings. An example of Greek architecture which survives today are the temples that they have created for their gods. The Romans were the first builders to realise the potential of arches for large and well-defined interior spaces.
Domes were introduced to several Roman building designs such as temples, thermae, palaces, mausolea and later also to churches. Ancient Romans are well-known for building longstanding structures, with many iconic landmarks which can be seen even today.
They made it because they are the originators of ‘hydraulic cement-based concrete’ and which we call cement.
When we compare ancient and modern architecture, the most visible differences are the materials used and the structure. In modern architecture, they use the best materials we can find today.
Structures of ancient architectural buildings were more complicated than modern structures as they had to show their uniqueness and culture.
We should rotect ancient architecture as it helps keep communities beautiful, vibrant and livable. Also, it gives people a stake in their surroundings. It connects people with their past too. When considering these reasons it is obvious that we must protect our ancient architecture.