The largest self-built castle in the U.S., six decades in the making.

16,500-acre ranch filled with American heritage, geological wonders, and a giant pile of tires is the crown jewel of an intriguing tug-of-war.

The site of the "Bone Wars" between two rival paleontologists during the dinosaur rush of the 19th century.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.