Saudi Arabia

The train is Spanish Talgo 350 SRO with an operating speed of 300 km/h

During the later days of the Nabatean Kingdom there was a construction boom, of hereditary tombs. Anyone who could afford to have a tomb commissioned had a tomb commissioned for themselves and their descendants. The largest tomb is now known as the Lonely Palace and was commissioned by a rich merchant. He though passed away before it was completed, and so it was never completed and he wasn’t buried in it. Making the Lonely Palace not just unique in size and number of pillars on its facade, four instead of two, but also in never being used as a tomb.