Apart from masonries and stones, or the peculiar Roman concrete utilized in ancient times, modern arches employ steel and pre-stressed concrete. In addition, beams and trusses are employed in modern arches, making the construction more sturdy and capable of spanning greater distances than historical arches. The key difference between modern and ancient arches is their material composition. Ancient arches were made out of stone because there were no other options available at the time they were built. Modern arches are primarily made out of metal because we have advanced materials that allow us to create structures that are strong yet light. There are several types of arches including: half-arches, semi-circular arches, ogee arches, and pointed archways. Each type of arch has its own unique characteristics which will influence how they are constructed. For example, a half-arch has equal heights on each side of the opening it spans, while a semi-circular arch has one side much higher than the other. An ogee arch has a wide base and a narrow peak, and pointed archways have straight sides with sharp points. It is important to understand the differences between these various types of arches before starting a project. If you choose to use an ancient arch as your template, make sure to follow the specifications given by the architect or engineer who created it. Modern architects have many options when designing arches.