A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

This super steep hike ascends 2,000 feet in less than a mile.

Abandoned silver mine strewn with wrecked and twisted structures.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

A lively annual event in which thousands of people race to push coffins heavy with bodies up a hill.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.