3. Nintoku’s Tomb (Estimated Cost: $300 million)
The Nintoku’s Tomb is the largest tomb in Japan and the third largest in the world. It is located in Sakai, Osaka, Japan. Japanese people call it Kofun. It is a megalithic tomb which is a man-made island shaped like a keyhole if seen from above.
Nintoku was the 16th emperor of Japan from the year of 313 to 399. He was believed to be 142 years old when he died.
His tomb lies in the center of this big island surrounded by moats. It is around 486 meters long, 307 meters wide, and 35.8 meters high. Visitors may enter the front worshiping place only.
To construct such big island, it requires at least 2.7 million tons of dirt. From that alone, the cost needed is around $135 million. Thus, the estimated building cost is $300 million.