Tomb of Cyrus

The Tomb of Cyrus is the burial place of the ancient Cyrus the Great of Persia. The tomb is located in modern day Iran, at the Pasargadae World Heritage Site. Cyrus the Great (c. 590 BC; August 529 BC or 530 BC), or Cyrus II of Persia was a Persian Shahenshah (or Emperor), who founded of the Persian Empire under the Achaemenid dynasty. This empire thence expanded under his rule, as Cyrus eventually conquered the majority of Southwest Asia as well as much of Central Asia, from Egypt and the Hellespont to the Indus River in the east, to create the most expansive nation the world had seen up until that era.

The tomb is the oldest base-isolated structure in the world.

Description text from Wikipedia.