An off-the-beaten path cave with an underground lake.

The ruins of the "20-year town" lay out among the mountains of Alberta.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

Legend has it fairies gathered at the site of this medieval castle.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

The remains of a sunken military ship wreck visible through clear water.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

305 homemade stone stairs wind their way up the Hamilton escarpment.

Stunning views over Ontario's old-growth pine forests.

Colorado's only true geyser is hidden within the San Juan National Forest.

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

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Abandoned silver mine strewn with wrecked and twisted structures.

When ecosystems collide in the arid Southwest.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.