The famed architect designed this Minnesota gas station of the future with a lookout tower.

A spooky defunct railroad tunnel now part of a sprawling trail.

A haunting army of decomposing, moss-covered stuffed animals and dolls guard this swinging truss.

The watery grave of an impractical idea.

This rare vessel mixed luxury with labor before being converted to a museum and sometimes haunted maze.

This posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.

This quirky roadside attraction provides insight into Minnesota's logging history.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

This vintage train once gave new meaning to “swimming upstream.”

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

These giant metal horses graze on a hilltop near the Montana highway.