A century-long search for a church that was never there.

An industrial relic is now one of Europe's most staggering art spaces.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

No need to strap in for a “ride” on this walkable roller coaster.

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

Mile-long cave system near Great Smoky Mountains.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

The world's longest known cave system.

One of the largest, oldest, darkest, quietest motel rooms in the world.

A tunnel with windows, so you don't miss out on the impressive views.

A vertically floating hemlock controls the waves and weather at Crater Lake.

This extinct shield volcano is the lightning rod of the Cascades.

Massive crater in central Oregon.

A volcanic landmark located on an Ice age lake bed.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

A crack flared at the base provides a pathway completely through a sandstone ridge near Moab.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

Supplies are schlepped up by llamas at this century-old inn, accessible only by hiking trails in the Great Smokies.

Trek up to an abandoned fire lookout from the 1930s for an unimpeded view.

This art center is way beyond your average pumpkin-carving operation.

A non-native grove of 241 redwoods in Southern California.

How this Pine Barrens hill got its name is uncertain, but on a good day the view from the fire tower is crystal clear.