roads expansive, but they were also well planned and maintained. The Incans made a standard design for the roads and carried out the standard throughout the empire. Roads were built so that they were easily drained to prevent damage to the roads and flooding. The roads were cleaned often by designated maintenance workers. Lodges for traveling nobles were also constructed alongside the roads. Rest stops called tambos were built close to roads with water supplies leading to each so that travelers and messengers could have a place to rest and clean water to drink. Military storehouses were also built near the roads and kept food for when troops were traveling. Bridges were built across rivers that were too deep to cross and large flat stones were placed along the sides of roads as markers to distinguish different sections of the roads. The Inca relied on and worshiped water heavily. A temple was built, the Incamisana, to worship water and the deities granting them water. The temple, as well as many other buildings constructed by the Inca, incorporated aesthetics, underground water conduits and hydraulic systems. The Inca understood water was needed for agricultural production (used in terraces) and for domestic purposes. The civil engineers of the time for the Inca were tasked with laying out diversion and canal routes to a designated spot, finding what water source would give the desired flow rate and what elevation the water source would need to be tapped from for gravity to work effectively. Sanitation was also well known by the Inca. The Inca had their own wastewater treatment systems and it is documented that they would collect the human waste to perform land application to help ensure successful harvest seasons. References External links Inca Architecture