Legend says train robbers stashed their gold within the depths of this unusual cave.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

Roman ruins top white travertine terraces formed by ancient hot springs.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Legends surround this jagged rock formation in the New Mexico desert.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Museum dedicated to the art of cutting and polishing stones.

A former atom smasher turned into an art gallery.

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.