Marcus Vitruvius Pollio was a Roman architect, engineer, and writer who lived during the 1st century BC. He is best known for his treatise De Architectura, which is considered one of the most important works on architecture ever written.

The Appian Way, built in the 4th century BC, is one of the oldest and most important Roman roads. It connected Rome to Brindisi, a port city in southeastern Italy, and was a major route for trade and military campaigns.

Galen, a Greek physician who lived in the 2nd century AD, is considered the father of modern medicine. He made significant contributions to the fields of anatomy, physiology, and pharmacology, and his writings were influential for centuries.

The sundial, which measures time based on the position of the sun, was invented by the Romans and is still used today, particularly for decorative purposes.

Roman mosaics were made using small pieces of colored stone, glass, or ceramic called tesserae. These tesserae were arranged to create intricate designs and patterns.

Hadrian, who ruled from 117 to 138 AD, commissioned the construction of the Pantheon, which was completed in 128 AD. The Pantheon is considered one of the greatest architectural achievements of ancient Rome.

The Roman thermae were primarily used for hygiene and relaxation. They were elaborate complexes that included pools of varying temperatures, steam rooms, and massage rooms.

The ballista was a powerful torsion-powered siege engine used by the Romans to launch projectiles such as stones, spears, and flaming arrows.

The Roman roads were primarily built to facilitate trade and commerce throughout the empire. They also played a crucial role in military campaigns and the movement of troops.

The Aqua Claudia, built in the 1st century AD, was a remarkable aqueduct that supplied water to Rome from a distance of over 60 kilometers. It was known for its impressive arches and engineering prowess.

Ptolemy, a Greek mathematician, astronomer, and geographer who lived in the 2nd century AD, is considered the greatest Roman mathematician. He is known for his work on astronomy, trigonometry, and geography.

The aqueduct was a system of pipes and channels that transported water from distant sources to cities and towns, providing a reliable supply of water for drinking, sanitation, and other purposes.

Opus caementicium was a type of concrete made by mixing lime, sand, gravel, and pozzolana, a volcanic ash found near Rome. Pozzolana gave the concrete its strength and durability.

Vespasian, who ruled from 69 to 79 AD, initiated the construction of the Colosseum, which was completed by his son Titus in 80 AD.

Bronze, an alloy of copper and tin, was the most commonly used metal by the Romans. It was used for a wide range of purposes, including the production of weapons, armor, tools, and sculptures.