A harrowing trail up a mile-high mountain.

Minnesota's oldest and deepest mine is now an underground physics laboratory.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

Half of a waterfall goes into the river while the other half seems to disappear.

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

This church, buried halfway in lava rock, is all that remains of a Mexican village destroyed by a volcano.