13. Tomb of New Grange (Estimated Cost: $1.5 million)
The tomb of New Grange is believed to be built in the Stone Age of 3200 BC. This is one of the very few surviving Neolithic buildings in the world. It is located in the Boyne Valley, Ireland.
It is actually part of a large complex of monuments built along a bend of the River Boyne. The whole monuments tell a story about the Neolithic farming community, especially the tomb.
The tomb is actually a passage to chambers underneath a 85-meter-of-diameter mound. It is where the community buried its departed ones. And according to local history, it is not just a simple burial. It actually housed the spirits of the ancestors.
This 13.5-meter-high tomb is basically made of stones. Most of them are engraved with Megalithic art of Ancient Ireland. To build the same mound from the same engraved stones, the estimated cost is $1.5 million.